diff --git a/app/build.gradle b/app/build.gradle
index 3c3711b..0c342bd 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -52,4 +52,5 @@ dependencies {
     implementation 'androidx.core:core-ktx:1.8.0'
     implementation 'androidx.appcompat:appcompat:1.5.0'
     implementation 'com.google.android.material:material:1.6.1'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
 }
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index f318e6c..a6bba64 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -12,6 +12,26 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.Activities"
-        tools:targetApi="31" />
+        tools:targetApi="31">
+        <activity
+            android:name=".ActivityD"
+            android:exported="false" />
+        <activity
+            android:name=".ActivityC"
+            android:exported="false" />
+        <activity
+            android:name=".ActivityB"
+            android:exported="false" />
+        <activity
+            android:name=".ActivityA"
+            android:launchMode="singleTask"
+            android:exported="true">
+
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
 
 </manifest>
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/activities/ActivityA.kt b/app/src/main/java/otus/gpb/homework/activities/ActivityA.kt
new file mode 100644
index 0000000..7b927ec
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/activities/ActivityA.kt
@@ -0,0 +1,21 @@
+package otus.gpb.homework.activities
+
+import android.content.Intent
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import android.widget.Button
+
+class ActivityA : AppCompatActivity(R.layout.activity_a) {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        findViewById<Button>(R.id.open_activity_b_btn).setOnClickListener { runActivityB() }
+    }
+
+    private fun runActivityB() {
+        val intent = Intent(this, ActivityB::class.java).apply {
+            flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_MULTIPLE_TASK
+        }
+        startActivity(intent)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/activities/ActivityB.kt b/app/src/main/java/otus/gpb/homework/activities/ActivityB.kt
new file mode 100644
index 0000000..ba9dd3e
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/activities/ActivityB.kt
@@ -0,0 +1,19 @@
+package otus.gpb.homework.activities
+
+import android.content.Intent
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import android.widget.Button
+
+class ActivityB : AppCompatActivity(R.layout.activity_b) {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        findViewById<Button>(R.id.open_activity_c_btn).setOnClickListener { runActivityC() }
+    }
+
+    private fun runActivityC() {
+        val intent = Intent(this, ActivityC::class.java)
+        startActivity(intent)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/activities/ActivityC.kt b/app/src/main/java/otus/gpb/homework/activities/ActivityC.kt
new file mode 100644
index 0000000..85c114c
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/activities/ActivityC.kt
@@ -0,0 +1,39 @@
+package otus.gpb.homework.activities
+
+import android.content.Intent
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import android.widget.Button
+
+class ActivityC : AppCompatActivity(R.layout.activity_c) {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        findViewById<Button>(R.id.close_stack_btn).setOnClickListener { closeTask() }
+        findViewById<Button>(R.id.open_activity_a_btn).setOnClickListener { openActivityA() }
+        findViewById<Button>(R.id.open_activity_d_btn).setOnClickListener { openActivityD() }
+        findViewById<Button>(R.id.close_activity_c_btn).setOnClickListener { closeActivityC() }
+    }
+
+    private fun openActivityA() {
+        val intent = Intent(this, ActivityA::class.java)
+        startActivity(intent)
+    }
+
+    private fun openActivityD() {
+        val intent = Intent(this, ActivityD::class.java).apply {
+            flags = Intent.FLAG_ACTIVITY_CLEAR_TASK or Intent.FLAG_ACTIVITY_NEW_TASK
+        }
+        startActivity(intent)
+    }
+
+    private fun closeActivityC() {
+        finish()
+    }
+
+    private fun closeTask() {
+        finishAffinity()
+        val intent = Intent(this, ActivityA::class.java)
+        startActivity(intent)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/activities/ActivityD.kt b/app/src/main/java/otus/gpb/homework/activities/ActivityD.kt
new file mode 100644
index 0000000..74c0baf
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/activities/ActivityD.kt
@@ -0,0 +1,10 @@
+package otus.gpb.homework.activities
+
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+
+class ActivityD : AppCompatActivity(R.layout.activity_d) {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_a.xml b/app/src/main/res/layout/activity_a.xml
new file mode 100644
index 0000000..dd52128
--- /dev/null
+++ b/app/src/main/res/layout/activity_a.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="#f44336"
+    tools:context=".ActivityA">
+
+    <Button
+        android:id="@+id/open_activity_b_btn"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        android:text="Open Activity B"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_b.xml b/app/src/main/res/layout/activity_b.xml
new file mode 100644
index 0000000..e29e268
--- /dev/null
+++ b/app/src/main/res/layout/activity_b.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="#4caf50"
+    tools:context=".ActivityB">
+
+    <Button
+        android:id="@+id/open_activity_c_btn"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        android:text="Open Activity C"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_c.xml b/app/src/main/res/layout/activity_c.xml
new file mode 100644
index 0000000..a035e62
--- /dev/null
+++ b/app/src/main/res/layout/activity_c.xml
@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="#2196f3"
+    tools:context=".ActivityC">
+
+    <Button
+        android:id="@+id/open_activity_a_btn"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        android:text="Open Activity A"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+
+    <Button
+        android:id="@+id/open_activity_d_btn"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/open_activity_a_btn"
+        android:text="Open Activity D"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+
+    <Button
+        android:id="@+id/close_activity_c_btn"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/open_activity_d_btn"
+        android:text="Close Activity C"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+
+    <Button
+        android:id="@+id/close_stack_btn"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/close_activity_c_btn"
+        android:text="Close Stack"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_d.xml b/app/src/main/res/layout/activity_d.xml
new file mode 100644
index 0000000..c40856b
--- /dev/null
+++ b/app/src/main/res/layout/activity_d.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="#ffeb3b"
+    tools:context=".ActivityD">
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file