using System;

public class Program

{

    public static int search(int [] arr, int x)

    {

        int n = arr.Length;

        for(int i = 0; i < n; i++)

        {

            if(arr[i] == x)

                return i;

        }

        return -1;

    }

    public static void Main()

    {

        int [] arr = { 2, 4, 6, 8, 10 };

        int x = 8;

        int val = search(arr, x);

        if(val == -1)

            Console.WriteLine("The element is not present in this array");

        else

            Console.WriteLine("The element is present at index "+ val);

    }

}