using System;
using System.Collections.Generic;
using System.Linq;
using static System.Console;
using static System.Math;

class MainClass : Scanner
{
    static (int x, int y)[] dd = new (int x, int y)[4] { (1, 0), (0, 1), (-1, 0), (0, -1) };
    static void Main()
    {
        var (H, W) = ReadTuple<int,int>();
        var map = new bool[H, W];
        for (int i = 0; i < H; i++)
        {
            var s = RString();
            for (int j = 0; j < W; j++)
            {
                map[i, j] = s[j] == '#';
            }
        }
        var used = new bool[H, W];
        long ans = 0;
        var que = new Queue<(int y,int x,bool color)>();
        for (int i = 0; i < H; i++)
        {
            for (int j = 0; j < W; j++)
            {
                if (map[i, j] && !used[i, j])
                {
                    que.Enqueue((i, j, true));
                    used[i, j] = true;
                }
                else continue;

                long wc = 0;
                long bc = 1;
                while (que.Count > 0)
                {
                    var p = que.Dequeue();
                    foreach (var item in dd)
                    {
                        int nx = p.x + item.x;
                        int ny = p.y + item.y;

                        bool ncolor = !p.color;
                        if (!(0 <= ny && ny < H && 0 <= nx && nx < W)) continue;
                        if (used[ny, nx] || map[ny, nx] == p.color) continue;

                        used[ny, nx] = true;
                        if (ncolor) bc++;
                        else wc++;
                        que.Enqueue((ny, nx, ncolor));
                    }

                    if (que.Count == 0)
                    {
                        ans += bc * wc;
                    }
                }
            }
        }
        WriteLine(ans);
    }
}



class Scanner
{
    public static string RString() => Console.ReadLine();
    public static int RInt() => ReadTuple<int>();
    public static long RLong() => ReadTuple<long>();
    public static double RDouble() => ReadTuple<double>();

    public static string[] RStrings() => Console.ReadLine().Split();
    public static int[] RInts() => Array.ConvertAll(Console.ReadLine().Split(), int.Parse);
    public static long[] RLongs() => Array.ConvertAll(Console.ReadLine().Split(), long.Parse);
    public static double[] RDoubles() => Array.ConvertAll(Console.ReadLine().Split(), double.Parse);
    public static int[] RInts(Func<string, int> func) => Console.ReadLine().Split().Select(func).ToArray();
    public static long[] RLongs(Func<string, long> func) => Console.ReadLine().Split().Select(func).ToArray();
    public static double[] RDoubles(Func<string, double> func) => Console.ReadLine().Split().Select(func).ToArray();
    //public static string[] RStrings(Func<string, string> func) => Console.ReadLine().Split().Select(func).ToArray();

    public static T1 ReadTuple<T1>()
    {
        var r = RString();
        var r1 = (T1)Convert.ChangeType(r, typeof(T1));
        return r1;
    }
    public static (T1, T2) ReadTuple<T1, T2>()
    {
        var r = RStrings();
        var r1 = (T1)Convert.ChangeType(r[0], typeof(T1));
        var r2 = (T2)Convert.ChangeType(r[1], typeof(T2));
        return (r1, r2);
    }
    public static (T1, T2, T3) ReadTuple<T1, T2, T3>()
    {
        var r = RStrings();
        var r1 = (T1)Convert.ChangeType(r[0], typeof(T1));
        var r2 = (T2)Convert.ChangeType(r[1], typeof(T2));
        var r3 = (T3)Convert.ChangeType(r[2], typeof(T3));
        return (r1, r2, r3);
    }
    public static (T1, T2, T3, T4) ReadTuple<T1, T2, T3, T4>()
    {
        var r = RStrings();
        var r1 = (T1)Convert.ChangeType(r[0], typeof(T1));
        var r2 = (T2)Convert.ChangeType(r[1], typeof(T2));
        var r3 = (T3)Convert.ChangeType(r[2], typeof(T3));
        var r4 = (T4)Convert.ChangeType(r[3], typeof(T4));
        return (r1, r2, r3, r4);
    }
}


Measured memory_bytes: 28512