#include <bits/stdc++.h>
#define IL inline
#define LL long long
#define eb emplace_back
#define L(i, j, k) for (int i = (j); i <= (k); ++i)
#define R(i, j, k) for (int i = (j); i >= (k); --i)
using namespace std;

constexpr int N = 3e3 + 9;
int n, m, f[N][N], g[N][N];
char s[N][N];

struct P {
  int x, y;

  bool operator == (const P &rhs) const {
    return x == rhs.x && y == rhs.y;
  }
} u[N * 2], v[N * 2], q[N * 2];

int main () {
  ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  cin >> n >> m;
  L (i, 1, n) cin >> (s[i] + 1);
  f[0][1] = g[n + 1][m] = 1;
  L (i, 1, n) {
    L (j, 1, m) {
      if (s[i][j] == '*') {
        continue;
      }
      f[i][j] |= f[i - 1][j] | f[i][j - 1];
    }
  }
  R (i, n, 1) {
    R (j, m, 1) {
      if (s[i][j] == '*') {
        continue;
      }
      g[i][j] |= g[i + 1][j] | g[i][j + 1];
    }
  }
  int all = 0;
  L (i, 1, n) {
    all += count(s[i] + 1, s[i] + m + 1, '.');
  }
  if (!f[n][m]) {
    cout << (LL)all * (all - 1) / 2 << '\n';
    return 0;
  }
  int x = 1, y = 1;
  L (i, 1, n + m - 1) {
    u[i] = {x, y};
    if (g[x + 1][y]) {
      ++x;
    } else {
      ++y;
    }
  }
  x = n, y = m;
  R (i, n + m - 1, 1) {
    v[i] = {x, y};
    if (f[x - 1][y]) {
      --x;
    } else {
      --y;
    }
  }
  int eq = 0;
  L (i, 1, n + m - 1) {
    if (u[i] == v[i]) {
      ++eq;
    }
  }
  LL as = (LL)eq * (all - 1) - (LL)eq * (eq - 1) / 2;
  L (i, 1, n + m - 1) {
    if (u[i] == v[i]) {
      continue;
    }
    int x = u[i].x, y = u[i].y;
    R (t, x - 1, 1) {
      if (f[t][x + y - t] && g[t][x + y - t]) {
        y += x - t;
        x = t;
        break;
      }
    }
    q[x + y - 1] = {x, y};
    int r = x, c = y;
    L (j, x + y, n + m - 1) {
      if (g[r + 1][c]) {
        ++r;
      } else {
        ++c;
      }
      q[j] = {r, c};
    }
    r = x, c = y;
    R (j, x + y - 2, 1) {
      if (f[r][c - 1]) {
        --c;
      } else {
        --r;
      }
      q[j] = {r, c};
    }
    L (j, 1, n + m - 1) {
      as += q[j] == v[j] && !(u[j] == v[j]);
    }
  }
  cout << as << '\n';
}
// I love WHQ!