using System;

public class Program

{

    public static double BT_323(double[,] Array, int colum) //Tinh tich cac gia tri duong tren 1 cot trong ma tran cac so thuc

        {

            double k = 1;

            for (int i = 0; i < Array.GetLength(0); i++)

            {

                for (int j = 0; j < Array.GetLength(1); j++)

                {

                    if (j == colum && Array[i, j] > 0)

                        k = k * Array[i, j];

                }

            }

            return k;

    }

}