diff --git a/src/main/kotlin/ru/otus/homework/functions.kt b/src/main/kotlin/ru/otus/homework/functions.kt
index 4a7fe1e..271387b 100644
--- a/src/main/kotlin/ru/otus/homework/functions.kt
+++ b/src/main/kotlin/ru/otus/homework/functions.kt
@@ -3,6 +3,32 @@ package ru.otus.homework
 import java.time.LocalDate
 
 fun main() {
+    val hmFun = HomeworkFunctions()
+
+    println("1. Функция сумма параметров")
+    val firstValue = 1
+    val secondValue = 2
+    val numbers = intArrayOf(3, 4, 5)
+    val result1 = hmFun.sum(firstValue, secondValue,*numbers)
+    println("Input: first = $firstValue, second = $secondValue, others = ${numbers.joinToString()}")
+    println("Output: $result1")
+    println()
+
+    println("2. Функция с необязательным параметром")
+    val customStrings = arrayOf("hello", "my", "dear", "teacher")
+    val customSeparator = '-'
+    val result2 = hmFun.joinStrings(*customStrings, separator = customSeparator)
+    println("Input: strings = ${customStrings.joinToString()}, separator = '$customSeparator'")
+    println("Output: $result2")
+    println()
+
+    println("4. Функция, измеряющая время")
+    val executionTime = hmFun.measureExecutionTime {
+        hmFun.longTask()
+    }
+
+    println("Время выполнения: $executionTime мс")
+
     println(calculate(10, 20))
     println(calculate(10, 20.5F))
     println(calculate(30.1F, 40.2F, 50.3F, 60.4F))
diff --git a/src/main/kotlin/ru/otus/homework/homeworkFunctions.kt b/src/main/kotlin/ru/otus/homework/homeworkFunctions.kt
new file mode 100644
index 0000000..60ea8d8
--- /dev/null
+++ b/src/main/kotlin/ru/otus/homework/homeworkFunctions.kt
@@ -0,0 +1,26 @@
+package ru.otus.homework
+
+class HomeworkFunctions {
+
+    fun sum(first: Int, second: Int, vararg others: Int): Int {
+        return first + second + others.sum()
+    }
+
+    fun joinStrings(vararg strings: String, separator: Char = ' '): String {
+        return strings.joinToString(separator.toString())
+    }
+
+    fun measureExecutionTime(block: () -> Unit): Long {
+        val startTime = System.currentTimeMillis()
+        block()
+        val endTime = System.currentTimeMillis()
+        return endTime - startTime
+    }
+
+    fun longTask() {
+        for (i in 1..5) {
+            println("Шаг $i")
+            Thread.sleep(500)
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/test/kotlin/ru/otus/homework/FunctionsTest.kt b/src/test/kotlin/ru/otus/homework/FunctionsTest.kt
index 93a36cf..08eb0b5 100644
--- a/src/test/kotlin/ru/otus/homework/FunctionsTest.kt
+++ b/src/test/kotlin/ru/otus/homework/FunctionsTest.kt
@@ -1,6 +1,7 @@
 package ru.otus.homework
 
 import org.junit.jupiter.api.Assertions
+import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Test
 
 class FunctionsTest {
@@ -11,4 +12,17 @@ class FunctionsTest {
             calculate(1, 2)
         )
     }
+
+    @Test
+    fun joinStringsTest() {
+        val hmFun = HomeworkFunctions()
+        assertEquals(
+            "str1 str2 str3",
+            hmFun.joinStrings("str1", "str2", "str3")
+        )
+        assertEquals(
+            "str1,str2,str3",
+            hmFun.joinStrings("str1", "str2", "str3", separator = ',')
+        )
+    }
 }
\ No newline at end of file