using System;

public class Program

{        

    static double[,] NhapMaTranSoThuc()

    {

        // Nhap so dong

        Console.WriteLine("Nhap so dong: ");

        int n = int.Parse(Console.ReadLine());

        Console.WriteLine("Nhap so cot: ");

        int m = int.Parse(Console.ReadLine());

​

        double[,] A = new double[n, m];

​

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

        {

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

            {

                Console.WriteLine("Nhap A[{0},{1}]", i, j);

                A[i, j] = double.Parse(Console.ReadLine());

            }

        }

        return A;

    }

    static int DemTanSuatX(double x, double[,] A)

    {

        int N = 0;

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

        {

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

            {

                if (A[i, j] == x)

                {

                    N++;

                }

            }

        }

        return N;

    }

​

    public static void Main()

    {

        // Nhap ma tran so thuc

        double[,] B = NhapMaTranSoThuc();

        // Dem so lan xuat hien cua gia tri X

        Console.WriteLine("Nhap gia tri X: ");

        double x = double.Parse(Console.ReadLine());

        int N = DemTanSuatX(x, B);

        Console.WriteLine("Tan suat xuat hien cua {0} trong ma tran la: {1}", x, N);

    }

}