using System;
using System.Linq;

namespace _02.SquaresInMatrix
{
    internal class Program
    {
        static void Main(string[] args)
        {
            int[] dims = Console.ReadLine().Split().Select(int.Parse).ToArray();
            int rows = dims[0];
            int cols = dims[1];
            int counter = 0;
            string[,] matrix = ReadStringMatrix(rows, cols);
            string[,] subMatrix = new string[2, 2];
            if (rows < 2 || cols < 2)
            {
                Console.WriteLine("0");
            }
            else
            {
                for (int row = 0; row < rows - 1; row++)
                {
                    for (int col = 0; col < cols - 1; col++)
                    {
                        if (row + 2 < matrix.GetLength(0) && col + 2 < matrix.GetLength(1))
                        {
                            subMatrix[0, 0] = matrix[row, col];
                            subMatrix[0, 1] = matrix[row, col + 1];
                            subMatrix[1, 0] = matrix[row + 1, col];
                            subMatrix[1, 1] = matrix[row + 1, col + 1];
                            if (IsAllSameValues(subMatrix))
                                counter++;
                        }
                    }
                }
                Console.WriteLine($"{counter}");
            }
        }

        static string[,] ReadStringMatrix(int rows, int cols)
        {
            string[,] stringMatrix = new string[rows, cols];

            for (int row = 0; row < rows; row++)
            {
                string[] rowInput = Console.ReadLine().Split().ToArray();

                for (int col = 0; col < cols; col++)
                {
                    stringMatrix[row, col] = rowInput[col];
                }
            }
            return stringMatrix;
        }

        static bool IsAllSameValues(string[,] matrix)
        {
            return true;
            //string value = matrix[0,0];
            for (int row = 0; row < matrix.GetLength(0); row++)
            {
                for (int col = 0; col < matrix.GetLength(1); col++)
                {
                    if (matrix[row, col] != matrix[0, 0])
                    {
                        return false;
                        break;
                    }
                }
            }
        }
    }
}