using System;

public class Program

{

    public static void Main()

    {

        int[]arr = new int[] {1,2,3,4,5};

        fun (ref arr);

        static void fun(ref int[] a)

        {

            for (int i = 0 ; i < a.Length; i++)

            {

                a[i] = a[i] * 5;

                Console.WriteLine(a[i] + " ");

            }

        }

    }

}