using System;

​

public class Program

{

    public static void Main()

    {

        int[, ] marks = new int[2, 10];

        int total_class1 =0;

        int total_class2 = 0;

        for (int i = 0; i < 2; i++)

        {

            for (int j = 0; j < 10; j++)

            {

                Console.WriteLine("please enter a mark: ");

                marks[i, j] = int.Parse(Console.ReadLine());//add i and j to per class

            }

        }

    }

}