// vvvvvvvvvvvv TEMPLATE vvvvvvvvvvvv
#include <bits/stdc++.h>
using namespace std; using ll = long long; using P = pair<ll, ll>;
const ll linf = 1e18; const double eps = 1e-12, pi = acos(-1);
#define FOR(i,a,b) for (ll i=(a),__last_##i=(b);i<__last_##i;i++)
#define RFOR(i,a,b) for (ll i=(b)-1,__last_##i=(a);i>=__last_##i;i--)
#define REP(i,n) FOR(i,0,n)
#define RREP(i,n) RFOR(i,0,n)
#define __GET_MACRO3(_1, _2, _3, NAME, ...) NAME
#define each(i,a) for (auto&& i : a)
#define rep(...) __GET_MACRO3(__VA_ARGS__, FOR, REP)(__VA_ARGS__)
#define rrep(...) __GET_MACRO3(__VA_ARGS__, RFOR, RREP)(__VA_ARGS__)
#define pb push_back
#define eb emplace_back
#define all(a) begin(a),end(a)
#define chmin(x,v) x = min(x, v)
#define chmax(x,v) x = max(x, v)
#define min(x,y) (x < y ? x : y)
#define max(x,y) (x < y ? y : x)
template<typename Head> void out(Head h) { cout << h << endl; } template<typename Head, typename... Tail>void out(Head h, Tail... t) { cout << h << " "; out(t...); }
template<typename T> istream& operator>>(istream& is, vector<T>& v) { each(x,v) is >> x; return is; }
template<typename T> ostream& operator<<(ostream& os, const vector<T>& v) { rep(i,v.size()) { if (i) os << " "; os << v[i]; } return os; }
ostream& operator<<(ostream& os, const vector<string>& v) { rep(i,v.size()) { if (i) os << endl; os << v[i]; } return os; }
template<typename T> ostream& operator<<(ostream& os, const vector<vector<T>>& v) { rep(i,v.size()) { if (i) os << endl; os << v[i]; } return os; }
template<typename T1, typename T2> ostream& operator<<(ostream& os, const pair<T1, T2>& p) { return os << "(" << p.first << ", " << p.second << ")"; }
struct yes_no : std::numpunct<char> { string_type do_truename() const { return "Yes"; } string_type do_falsename() const { return "No"; } };
void solve(); int main() {
  ios::sync_with_stdio(false); cin.tie(0); locale loc(locale(), new yes_no); cout.imbue(loc); cout << fixed << setprecision(10) << boolalpha;
  solve();
}
// ^^^^^^^^^^^^ TEMPLATE ^^^^^^^^^^^^
class UnionFind {
  vector<ll> par, h, sz;
public:
  UnionFind(ll size) : par(size, 0), h(size, 0), sz(size, 1) {
    rep(i, size) par[i] = i;
  }
  void unite(ll u, ll v) {
    u = root(u), v = root(v);
    if (u == v) return;
    if (h[u] < h[v]) {
      par[u] = v;
      sz[v] += sz[u];
    }
    else {
      par[v] = u;
      sz[u] += sz[v];
    }
    if (h[u] == h[v]) ++h[u];
  }
  ll size(ll v) {
    return sz[root(v)];
  }
  bool isUnited(ll u, ll v) {
    return root(u) == root(v);
  }
  ll root(ll v) {
    if (par[v] == v) return v;
    return par[v] = root(par[v]);
  }
};

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

void solve() {
  ll h, w; cin >> h >> w;
  vector<string> m(h); cin >> m;
  UnionFind uf(h * w);
  auto inRange = [&](ll x, ll y) {
    return 0 <= x && x < w && 0 <= y && y < h;
  };
  rep(y, h) rep(x, w) rep(d, 4) {
    ll nx = x + dx[d];
    ll ny = y + dy[d];
    if (!inRange(nx, ny)) continue;
    if (m[y][x] == m[ny][nx]) continue;
    uf.unite(y * w + x, ny * w + nx);
    // cout << "unite: " << x << " " << y << " " << nx << " " << ny << endl;
  }
  vector<vector<ll>> cnt(w*h, vector<ll>(2, 0));
  rep(y, h) rep(x, w) {
    ll id = uf.root(y * w + x);
    cnt[id][m[y][x] == '#']++;
  }
  ll ans = 0;
  rep(i, w*h) {
    ans += cnt[i][0] * cnt[i][1];
  }
  cout << ans << endl;
}


Measured memory_bytes: 13008