using System;
using System.Linq;
using System.Text;

namespace Squares_in_Matrix
{
    class Program
    {
        static bool IsEqualMatrix(char[,] matrix, int baseMatrixRow, int baseMatrixCol)
        {
            bool result = false;

            if (matrix[baseMatrixRow, baseMatrixCol] == matrix[baseMatrixRow, baseMatrixCol + 1])
            {
                if (matrix[baseMatrixRow, baseMatrixCol] == matrix[baseMatrixRow + 1, baseMatrixCol])
                {
                    if (matrix[baseMatrixRow, baseMatrixCol] == matrix[baseMatrixRow + 1, baseMatrixCol + 1])
                    {
                        result = true;
                    }

                }
            }

            return result;
        }// bool IsEqualMatrix(int baseMatrixRow, int baseMatrixCol, int row, int col)

        static void Main(string[] args)
        {
            int[] dimensions = Console.ReadLine().Split(' ', StringSplitOptions.RemoveEmptyEntries).Select(int.Parse).ToArray();
            int rows = dimensions[0];
            int cols = dimensions[1];

            char[,] arr = new char[rows, cols];

            for (int row = 0; row < rows; row++)
            {
                string[] temp = Console.ReadLine().Split(' ', StringSplitOptions.RemoveEmptyEntries);

                for (int col = 0; col < cols; col++)
                {
                    arr[row, col] = temp[col][0];
                }
            }

            int numEqualmatrix = 0;
            int endRow = arr.GetLength(0) - 1;
            int endCol = arr.GetLength(1) - 1;

            for (int row = 0; row < endRow; row++)
            {
                for (int col = 0; col < endCol; col++)
                {

                    if (IsEqualMatrix(arr, row, col))
                    {
                        numEqualmatrix++;
                    }

                }
            }

            Console.WriteLine(numEqualmatrix);
        }
    }
}