#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int h, w;
  cin >> h >> w;
  vector<string> s(h);
  rep(i, h) cin >> s[i];
  s[0][0] = s[h-1][w-1] = '.';
  auto dpf = vector(h, vector<char>(w));
  auto dpb = vector(h, vector<char>(w));
  dpf[0][0] = dpb[h-1][w-1] = true;
  rep(i, h) rep(j, w) if (dpf[i][j]) {
    if (i+1 < h && s[i+1][j] == '.') dpf[i+1][j] = true;
    if (j+1 < w && s[i][j+1] == '.') dpf[i][j+1] = true;
  }
  rrep(i, h) rrep(j, w) if (dpb[i][j]) {
    if (i && s[i-1][j] == '.') dpb[i-1][j] = true;
    if (j && s[i][j-1] == '.') dpb[i][j-1] = true;
  }
  int ans = h + w;
  if (dpf[h-1][w-1]) chmin(ans, h + w - 2);
  rep(i, h-1) {
    int jf = 0, jb = w - 1;
    while (jf < w && !dpf[i][jf]) jf++;
    while (jb >= 0 && !dpb[i+1][jb]) jb--;
    if (jf <= jb) chmin(ans, h + w - 1);
  }
  rep(j, w-1) {
    int i1 = 0, i2 = h - 1;
    while (i1 < h && !dpf[i1][j]) i1++;
    while (i2 >= 0 && !dpb[i2][j+1]) i2--;
    if (i1 <= i2) chmin(ans, h + w - 1);
  }
  cout << ans << '\n';
}