using System;

public class Program

{

    public static int NhapN(string note) {

        Console.WriteLine(note);

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

        return n;

    }

    public static int[,] NhapMaTran(string note) {

        int[,] arr;

        int n = NhapN("Nhap dong n: ");

        int m = NhapN("Nhap cot m: ");

        arr = new int[n, m];

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

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

                arr[i, j] = int.Parse(Console.ReadLine());

            }

        }

        return arr;

    }

    public static void XuatMaTran(int[,] arr) {

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

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

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

            }

            Console.WriteLine();

        }

    }

​

    public static int DemPhanTuCucDai(int[,] arr) {

        int count = 0;

        int[] dong = {-1, -1, -1, 0, 0, 1, 1, 1};

        int[] cot = {-1, 0, 1, -1, 1, -1, 0, 1};

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

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

                bool isMax = true;

                for (int k = 0; k < 8; k++) {

                    if (i + dong[k] >= 0 && j + cot[k] >= 0 && i + dong[k] < arr.GetLength(0) && j + cot[k] < arr.GetLength(1)) {

                        if (arr[i, j] == arr[i + dong[k], j + cot[k]]) {

                            isMax = false;

                            break;

                        }

                    }

                }

                if (isMax == true) {

                    count++;

                }

            }

        }

        return count;

    }

    public static void Main() {

        int[,] arr;

        arr = NhapMaTran("Nhap ma tran: ");

        XuatMaTran(arr);

        int result = DemPhanTuCucDai(arr);

        Console.Write(result);

    }

}