using System;

​

public class Program

{

    public static void Main()

    {   Random rand = new Random();

        int n = 5, m = 5;

        int Sumtri = 0;

        int[,]mas = new int[n,m];

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

        {

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

            {   

                mas[i,j] = rand.Next(0,10);

                Console.Write(mas[i,j]+" ");

            }

            Console.WriteLine();

        }

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

        {

            Sumtri += mas[2,j];

        }

     Console.Write(Sumtri);

    }   

}