using System;
public class Program
{
public static void Main()
var myArray = new int[]{1,2,34,4,3,25,342,23};
var find = Convert.ToInt32(Console.ReadLine());
for(var i = 0;i < myArray.Length;i++){
if(myArray[i] == find){
Console.WriteLine("index = " + i);
break;
}