#include <bits/stdc++.h>
#define pb push_back
#define eb emplace_back
#define fi first
#define se second
#define rep(i,N) for(long long i = 0; i < (long long)(N); i++)
#define repr(i,N) for(long long i = (long long)(N) - 1; i >= 0; i--)
#define rep1(i,N) for(long long i = 1; i <= (long long)(N) ; i++)
#define repr1(i,N) for(long long i = (N) ; (long long)(i) > 0 ; i--)
#define each(x,v) for(auto& x : v)
#define all(v) (v).begin(),(v).end()
#define sz(v) ((int)(v).size())
#define ini(...) int __VA_ARGS__; in(__VA_ARGS__)
#define inl(...) long long __VA_ARGS__; in(__VA_ARGS__)
#define ins(...) string __VA_ARGS__; in(__VA_ARGS__)
#define in2(N,s,t) rep(i,N){in(s[i] , t[i]);}
#define in3(N,s,t,u) rep(i,N){in(s[i] , t[i] , u[i]);}
using namespace std; void solve();
using ll = long long; template<class T = ll> using V = vector<T>;
using vi = V<int>; using vl = V<>; using vs = V<string>;
using vd = V<double>; using vvi = V< V<int> >; using vvl = V< V<> >;
template<typename T>using heap = priority_queue< T , V<T> , greater<T> >;
constexpr int inf = 1001001001; constexpr ll infLL = (1LL << 61) - 1;
struct IoSetupNya {IoSetupNya() { cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(15); cerr << fixed << setprecision(7);} } iosetupnya;
template<typename T, typename U> inline bool amin(T &x, U y) { return (y < x) ? (x = y, true) : false; }
template<typename T, typename U> inline bool amax(T &x, U y) { return (x < y) ? (x = y, true) : false; }
template<typename T, typename U> ostream& operator <<(ostream& os, const pair<T, U> &p) { os << p.first << " " << p.second; return os; }
template<typename T, typename U> istream& operator >>(istream& is, pair<T, U> &p) { is >> p.first >> p.second; return is; }
template<typename T> ostream& operator <<(ostream& os, const vector<T> &v) { int s = (int)v.size(); rep(i,s) os << (i ? " " : "") << v[i]; return os; }
template<typename T> istream& operator >>(istream& is, vector<T> &v) { for(auto &x : v) is >> x; return is; }
void in(){} template <typename T,class... U> void in(T &t,U &...u){ cin >> t; in(u...);}
void out(){cout << "\n";} template <typename T,class... U> void out(const T &t,const U &...u){ cout << t; if(sizeof...(u)) cout << " "; out(u...);}
template<typename T>void die(T x){out(x); exit(0);}
#ifdef NyaanDebug
  #include "NyaanDebug.h"
  #define trc(...) do { cerr << #__VA_ARGS__ << " = "; dbg_out(__VA_ARGS__);} while(0)
  #define trca(v,N) do { cerr << #v << " = "; array_out(v , N);cout << endl;} while(0)
#else
  #define trc(...)
  #define trca(...)
  int main(){solve();}
#endif

using P = pair<ll,ll>; using vp = V<P>;
constexpr int MOD = /** 1000000007; //*/ 998244353;
//////////////////


// Union-Find木
// 初期化 UF(N); Nは要素数
// 結合 unite(x,y); 同じ集合か判定 same(x,y);
// 集合の数 count
struct UF{
  vector<int> par,sizes;
  vi black,white;
  int cnt;
  UF(int N) : par(N),sizes(N, 1),cnt(N),black(N,0),white(N,0)
  { for(int i=0; i<N; i++) par[i]=i; }

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

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

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

  void unite(int x, int y){
    x = find(x); y = find(y);
    if(x == y) return;
    if(sizes[x] < sizes[y]) swap(x,y);
    par[y] = x;
    sizes[x] += sizes[y];
    black[x] += black[y];
    white[x] += white[y];
    cnt--;
  }
  
  int count() const{return cnt;}
};

void solve(){
  ini(H , W);
  vs g(H); in(g);
  UF uf(H * W);
  auto idx=[&](int h,int w){return h * W + w;};
  rep(i , H) rep(j , W){
    if(g[i][j] == '.') uf.white[idx(i,j)]++;
    else uf.black[idx(i,j)]++;
  }
  rep(i , H) rep(j , W){
    if(i != H - 1){
      if(g[i][j] != g[i + 1][j])
        uf.unite(idx(i , j) , idx(i + 1 , j));
    }
    if(j != W - 1){
      if(g[i][j] != g[i][j + 1]){
        uf.unite(idx(i , j) , idx(i , j + 1));
      }
    }
  }
  ll ans = 0;
  vi used(H * W , 0);
  rep(i , H * W){
    if(used[uf.find(i)]) continue;
    int par = uf.find(i);
    ans += 1LL * uf.black[par] * uf.white[par];
    used[uf.find(i)] = 1;
  }
  out(ans);

}

Measured memory_bytes: 3584