using System;

public class Program

{

    public static void Main()

    {

        /*int[,] arr = new int[,] {

            {1, 1, 1, 1, 1, 1, 1, 1},

            {1, 1, 1, 1, 1, 1, 0, 0},

            {1, 0, 0, 1, 1, 0, 1, 1},

            {1, 2, 2, 2, 2, 0, 1, 0},

            {1, 1, 1, 2, 2, 0, 1, 0},

            {1, 1, 1, 2, 2, 2, 2, 0},

            {1, 1, 1, 1, 1, 2, 1, 1},

            {1, 1, 1, 1, 1, 2, 2, 1}

        };

        FloodFill(arr, 4, 4, 3);*/

        char[,] arr = new char[,] {

            {'O','O','O','O','X','X','O'},

            {'O','X','O','X','O','O','X'},

            {'X','X','X','X','O','X','O'},

            {'O','X','X','X','O','O','O'}

        };

        Console.Write(GetAdjacentX(arr));

    }

    public static int GetAdjacentX(char[,] arr)

    {

        int count = 0;

        int r = arr.GetLength(0), c = arr.GetLength(1);

        bool[,] visited = new bool[r, c];

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

        {

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

            {

                visited[i,j] = false;

            }

        }

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

        {

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

            {

                if(arr[i, j] == 'X' && !visited[i,j])

                {

                    count++;

                    visited[i,j] = true;

                    VisitAdjacents(arr, i, j, visited);

                }

            }

        }

        return count;

    }

    private static void VisitAdjacents(char[,] arr, int r, int c, bool[,] visited)

    {

        if(r < 0 || c < 0 || r > arr.GetLength(0) - 1 || c > arr.GetLength(1) - 1 || visited[r,c])

        {

            return;

        }

        if(arr[r,c] != 'X')

        {

            return;

        }

        VisitAdjacents(arr, r, c + 1, visited);

        VisitAdjacents(arr, r, c - 1, visited);

        VisitAdjacents(arr, r - 1, c, visited);

        VisitAdjacents(arr, r + 1, c, visited);

    }

    public static void FloodFill(int[,] arr, int x, int y, int newC)

    {

        Util(arr, x, y, arr[x,y], newC);

        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();

        }

    }

    private static void Util(int[,] arr, int r, int c, int prevC, int newC)

    {

        if(r > arr.GetLength(0) - 1 || c > arr.GetLength(1) - 1 || r < 0 || c < 0)

        {

            return;

        }

        if(arr[r,c] != prevC)

        {

            return;

        }

        arr[r,c] = newC;

        Util(arr, r-1, c, prevC, newC);

        Util(arr, r+1, c, prevC, newC);

        Util(arr, r, c - 1, prevC, newC);

        Util(arr, r, c + 1, prevC, newC);

    }

}