using System;

public class Program

{

    public static void Main()

    {

        int[] arr = new int[]{2,3,2,5,4,6,7};

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

        {

            arr[i]=arr[i]*2;

            Console.Write(arr[i]);

            Console.Write(",");

        }

    }

}