//
//
//  Codeforces: ganariya
//  AtCoder: ganariya2525
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//include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <unordered_map>
#include <climits>
#include <set>
#include <unordered_set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <queue>
#include <random>
#include <complex>
#include <regex>
#include <locale>
#include <random>
#include <type_traits>

using namespace std;

#define SHOW_VECTOR(v) {std::cerr << #v << "\t:";for(const auto& xxx : v){std::cerr << xxx << " ";}std::cerr << "\n";}
#define SHOW_MAP(v){std::cerr << #v << endl; for(const auto& xxx: v){std::cerr << xxx.first << " " << xxx.second << "\n";}}

using LL = long long;

//~~~~~~~~~~~~~~~~~~~~~_(＾～＾ ｣ ∠)_~~~~~~~~~~~~~~~~~~~~~

int dx[] = {0, 1, 0, -1};
int dy[] = {1, 0, -1, 0};

int H, W;

struct UnionFind {
    vector<int> par;
    vector<int> sizes;

    UnionFind(int n) :
            par(n), sizes(n, 1) {
        for (int i = 0; i < n; i++) par[i] = i;
    }

    int find(int x) {
        return x == par[x] ? x : par[x] = find(par[x]);
    }

    bool same(int x, int y) {
        return find(x) == find(y);
    }

    void unite(int x, int y) {
        x = find(x);
        y = find(y);
        if (x == y) return;
        if (sizes[x] < sizes[y]) swap(x, y);
        sizes[x] += sizes[y];
        par[y] = x;
    }

    int get_size(int x) {
        return sizes[find(x)];
    }

};

int f(int y, int x) {
    return y * W + x;
}

int main() {


    cin >> H >> W;

    vector<string> S(H);
    for (int i = 0; i < H; i++) cin >> S[i];

    UnionFind UF(H * W);
    for (int i = 0; i < H; i++) {
        for (int j = 0; j < W; j++) {
            for (int k = 0; k < 4; k++) {
                int toY = i + dy[k];
                int toX = j + dx[k];
                if (toY < 0 || toY >= H || toX < 0 || toX >= W) continue;
                if (S[i][j] != S[toY][toX]) {
                    UF.unite(f(i, j), f(toY, toX));
                }
            }
        }
    }

    vector<LL> black(H * W, 0);
    vector<LL> sizes(H * W, 0);

    for (int i = 0; i < H; i++) {
        for (int j = 0; j < W; j++) {
            if (S[i][j] == '#') {
                black[UF.find(f(i, j))]++;
            }
        }
    }

    LL ans = 0;
    for (int i = 0; i < H; i++) {
        for (int j = 0; j < W; j++) {
            if (f(i, j) == UF.find(f(i, j))) {
                LL all = UF.get_size(f(i, j));
                LL white = all - black[f(i, j)];
                ans += black[f(i, j)] * white;
            }
        }
    }

    cout << ans;

    return 0;
}










































Measured memory_bytes: 4224