matrix (C# Shell App Paste)

//Disclaimer: The creator of 'C# Shell (C# Offline Compiler)' is in no way responsible for the code posted by any user.
using System;
using System.IO;
using System.Linq;
using System.Collections.Generic;

namespace CSharp_Shell
{

    public class Program
    {
        public static void Main()
        {

            var size = Console.ReadLine().Split().Select(int.Parse).ToArray();
            var matrix = new int[size[0], size[1]];
            for (int r = 0; r < size[0]; r++)
            {
                var row = Console.ReadLine().Split().Select(int.Parse).ToArray();
                for (int c = 0; c < size[1]; c++)
                {
                    matrix[r, c] += row[c];
                }

            }

            foreach (var item in matrix)
            {
                Console.Write(item);
            }
        }
    }
}