diff --git a/src/main/kotlin/ru/otus/homework/main.kt b/src/main/kotlin/ru/otus/homework/main.kt
new file mode 100644
index 0000000..0e9ff82
--- /dev/null
+++ b/src/main/kotlin/ru/otus/homework/main.kt
@@ -0,0 +1,39 @@
+package ru.otus.homework
+
+import kotlin.system.measureTimeMillis
+
+fun fun1MandatoryAndOptionalParams(numberOne: Int, numberTwo: Int, vararg additionalNumber: Int): Int {
+    var sum = 0
+    for(i in additionalNumber)
+        sum += i
+    return numberOne + numberTwo + sum
+}
+
+fun fun2OptionalAndPositionalParams(vararg additionalStr: String, ch: Char=' '): String {
+    var result: String= ""
+    for(str in additionalStr)
+        result += str + ch
+    return result.dropLast(1)
+}
+
+fun sum(a: Int, b: Int){
+    var sum : Long = 0
+    repeat(a) {
+        repeat(b) {
+            sum += a+b
+        }
+    }
+}
+
+fun fun4Time(numberOne: Int, numberTwo: Int, myFunction: (Int, Int)->Unit): Long {
+    val time = measureTimeMillis {
+        myFunction(numberOne, numberTwo)
+    }
+    return time
+}
+
+fun main() {
+    println(fun1MandatoryAndOptionalParams(8, 45, 10,20))
+    println(fun2OptionalAndPositionalParams("one", "two", "free", "four", "five", ch= '*'))
+    println(fun4Time(100000,200000, :: sum))
+}
\ No newline at end of file
diff --git a/src/test/kotlin/ru/otus/homework/fun2OptionalAndPositionalParamsTest.kt b/src/test/kotlin/ru/otus/homework/fun2OptionalAndPositionalParamsTest.kt
new file mode 100644
index 0000000..e946ba9
--- /dev/null
+++ b/src/test/kotlin/ru/otus/homework/fun2OptionalAndPositionalParamsTest.kt
@@ -0,0 +1,20 @@
+package ru.otus.homework
+
+import org.junit.jupiter.api.Assertions.*
+import org.junit.jupiter.api.Test
+
+class fun2OptionalAndPositionalParamsTest {
+    @Test
+    fun `testcase 1`() {
+        val expected : String = "str1 str2 str3"
+        val actual = fun2OptionalAndPositionalParams("str1","str2","str3")
+        assertEquals(expected, actual)
+    }
+
+    @Test
+    fun `testcase 2`() {
+        val expected : String = "str1,str2,str3"
+        val actual = fun2OptionalAndPositionalParams("str1","str2","str3",ch=',')
+        assertEquals(expected, actual)
+    }
+}