#include <bits/stdc++.h>
using namespace std;

const int MXN = 3005;
int N, M, V, luc[MXN][MXN], ldc[MXN][MXN], rc[MXN * 2], bp;
short rn[MXN][MXN], ln[MXN][MXN];
bool mat[MXN][MXN];
long long ans;

int main() {
  scanf("%d%d", &N, &M);
  for (int i(0); i != N; ++i) {
    char c(0);
    for (int j(0); j != M; ++j) {
      scanf(" %c", &c);
      V += mat[i][j] = (c == '.');
    }
  }
  rn[N - 1][M - 1] = ln[N - 1][M - 1] = (mat[N - 1][M - 1] ? 2 : -1);
  for (int i(N - 1); ~i; --i) {
    for (int j(M - 1 - (i == N - 1)); ~j; --j) {
      if (!mat[i][j]) {
        ln[i][j] = rn[i][j] = -1;
        continue;
      }
      if (j + 1 != M && ~rn[i][j + 1]) rn[i][j] = 0;
      else if (i + 1 != N && ~rn[i + 1][j]) rn[i][j] = 1;
      else rn[i][j] = -1;
      if (i + 1 != N && ~ln[i + 1][j]) ln[i][j] = 1;
      else if (j + 1 != M && ~ln[i][j + 1]) ln[i][j] = 0;
      else ln[i][j] = -1;
    }
  }
  if (ln[0][0] == -1) {
    printf("%lld\n", V * 1LL * (V - 1) / 2);
    return 0;
  }
  for (int x(0), y(0);;) {
    rc[x + y] = x;
    if (rn[x][y] == 2) break;
    if (rn[x][y] == 1) ++x;
    else ++y;
  }
  ldc[N - 1][M - 1] = 1;
  for (int i(N - 1); ~i; --i) {
    for (int j(M - 1 - (i == N - 1)); ~j; --j) {
      if (ln[i][j] == -1) continue;
      ldc[i][j] = (ln[i][j] ? ldc[i + 1][j] : ldc[i][j + 1])
                + (rc[i + j] == i);
    }
  }
  luc[0][0] = 1;
  for (int i(0); i != N; ++i) {
    for (int j(i == 0); j != M; ++j) {
      if (!mat[i][j]) {
        luc[i][j] = -1;
        continue;
      }
      if (j && ~luc[i][j - 1]) luc[i][j] = luc[i][j - 1] + (rc[i + j] == i);
      else if (i && ~luc[i - 1][j]) luc[i][j] = luc[i - 1][j] + (rc[i + j] == i);
      else luc[i][j] = -1;
    }
  }
  for (int x(0), y(0);;) {
    if (rc[x + y] == x) ++bp;
    else {
      int yy(y + 1);
      while (ln[x + y - yy][yy] == -1 || luc[x + y - yy][yy] == -1) ++yy;
      int xx(x + y - yy);
      ans += luc[xx][yy] + ldc[xx][yy] - (rc[x + y] == xx);
    }
    if (ln[x][y] == 2) break;
    if (ln[x][y] == 1) ++x;
    else ++y;
  }
  printf("%lld\n", ans + bp * 1LL * (V - N - M + 1) + bp * 1LL * (bp - 1) / 2);
  return 0;
}