3.3

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FifthProject
{
    class Program
    {
        static void Main(string[] args)
        {
            int sum1 = 0;
            int sum2 = 1;

            int[,] matrix =
                {
                {4,5,7},
                {234,236,67},
                {123,345,34534}
                };

            for (int i = 0; i < matrix.GetLength(1); i++)
            {
                sum1 += matrix[1,i];
            }
            for (int i = 0; i < matrix.GetLength(1); i++)
            {
                sum2 *= matrix[i, 0];
            }

            Console.WriteLine(sum1);
            Console.WriteLine(sum2);
        }
    }
}