#include <bits/stdc++.h>

using namespace std;

typedef unsigned long long ull;
typedef long long ll;
typedef long double ld;
#define int ll
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector< vi > vvi;
typedef vector< vvi > vvvi;
typedef vector<short> vs;
typedef vector<vs> vvs;
typedef vector<vvs> vvvs;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<vvl> vvvl;
typedef vector<ld> vld;
typedef vector<vld> vvld;
typedef vector<vvld> vvvld;
typedef vector<string> vst;
typedef vector<vst> vvst;
typedef pair<ld, ld> pld;
typedef complex<double> base;
typedef complex<int> point;

#define inmin(a, b) a = min(a, (b))
#define inmax(a, b) a = max(a, (b))
#define ALL(a) a.begin(),a.end()
#define RALL(a) a.rbegin(),a.rend()
#define sqr(x) ((x) * (x))
#define fori(i, n) for(int i = 0; i < int(n); ++i)
#define SZ(a) ((int)((a).size()))
#define triple(T) tuple<T, T, T>
#define quad(T) tuple<T, T, T, T>

#ifdef MAX_HOME
#define cerr cout
#else
#define cerr if (false) cerr
#endif

#define watch(x) cerr << (#x) << " = " << (x)    << endl;

const double PI = 2 * acos(0.0);

const string DIGITS = "0123456789";
const string ALPH = "abcdefghijklmnopqrstuvwxyz";

template <class T0, class T1>
inline ostream & operator << (ostream &out, pair<T0, T1> &a) {
    return out << "{" << a.first << ", " << a.second << "}";
}

template <class T0, class T1, class T2>
inline ostream & operator << (ostream &out, tuple<T0, T1, T2> &a) {
    return out << "{" << get<0>(a) << ", " << get<1>(a) << ", " << get<2>(a) << "}";
}

template <class T0, class T1, class T2, class T3>
inline ostream & operator << (ostream &out, tuple<T0, T1, T2, T3> &a) {
    return out << "{" << get<0>(a) << ", " << get<1>(a) << ", " << get<2>(a) << ", " <<  get<3>(a) << "}";
}

template<class T>
inline ostream & operator << (ostream &out, vector<T> &a) {
    out << "[";
    fori (i, a.size())
        out << a[i] << vector<string>{", ", "]  "}[i + 1 == a.size()];
    return out;
}



void smain();

signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

#ifdef MAX_HOME
    freopen("input.txt", "r", stdin);
    clock_t start = clock();
#endif
    cout << setprecision(12) << fixed;
    smain();
#ifdef MAX_HOME
    cout << "\n\n\n\nTOTAL EXECUTION TIME: " << float( clock () - start ) /  CLOCKS_PER_SEC << endl;
#endif
}

const int N = 409;

string mat[N];
int h, w;

vi di = {0, 0, 1, -1};
vi dj = {1, -1, 0, 0};

inline bool in_bounds(int i, int j) {
    return i >= 0 && i < h && j < w && j >= 0;
}

inline bool in_bounds(pii v) {
    return in_bounds(v.first, v.second);
}

char used[N][N];

void dfs(pii v, int &cntb, int &cntw) {
    used[v.first][v.second] = 1;
    mat[v.first][v.second] == '#' ? ++cntb : ++cntw;

    fori (dir, di.size()) {
        pii to = {v.first + di[dir], v.second + dj[dir]};
        if (in_bounds(to) && !used[to.first][to.second] && mat[to.first][to.second] != mat[v.first][v.second])
            dfs(to, cntb, cntw);
    }
}

void smain() {

    cin >> h >> w;
    fori (i, h) cin >> mat[i];

    int ans = 0;
    fori (i, h) fori (j, w) if (!used[i][j]) {
        int cntb = 0, cntw = 0;
        dfs({i, j}, cntb, cntw);
        ans += cntb * cntw;
    }
    cout << ans;
}

Measured memory_bytes: 15616