#include <bits/stdc++.h>
#ifdef LOCAL
#include <debug.hpp>
#else
#define debug(...) void(0)
#endif

using namespace std;

typedef long long ll;
#define all(x) begin(x), end(x)
constexpr int INF = (1 << 30) - 1;
constexpr long long IINF = (1LL << 60) - 1;

template <class T> istream& operator>>(istream& is, vector<T>& v) {
    for (auto& x : v) is >> x;
    return is;
}

template <class T> ostream& operator<<(ostream& os, const vector<T>& v) {
    auto sep = "";
    for (const auto& x : v) os << exchange(sep, " ") << x;
    return os;
}

template <class T, class U = T> bool chmin(T& x, U&& y) { return y < x and (x = forward<U>(y), true); }

template <class T, class U = T> bool chmax(T& x, U&& y) { return x < y and (x = forward<U>(y), true); }

template <class T> void mkuni(vector<T>& v) {
    sort(begin(v), end(v));
    v.erase(unique(begin(v), end(v)), end(v));
}

template <class T> int lwb(const vector<T>& v, const T& x) { return lower_bound(begin(v), end(v), x) - begin(v); }

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int H, W;
    cin >> H >> W;
    vector<string> S(H);
    for (auto& s : S) cin >> s;

    vector ok(H, vector<bool>(W, false)), dp(H, vector<bool>(W, false));
    auto check = [&]() {
        for (int x = 1; x < H - 1; x++) {
            for (int y = 1; y < W - 1; y++) {
                ok[x][y] = true;
                dp[x][y] = false;
            }
        }
        for (int x = 0; x < H; x++) {
            for (int y = 0; y < W; y++) {
                if (S[x][y] != '#') continue;
                for (int dx = -1; dx <= 1; dx++) {
                    for (int dy = -1; dy <= 1; dy++) {
                        int nx = x + dx, ny = y + dy;
                        if (nx < 0 or H <= nx or ny < 0 or W <= ny) continue;
                        ok[nx][ny] = false;
                    }
                }
            }
        }
        queue<pair<int, int>> que;
        dp[1][1] = true;
        que.emplace(1, 1);
        while (not que.empty()) {
            auto [x, y] = que.front();
            que.pop();
            for (int dx = -1; dx <= 1; dx++) {
                for (int dy = -1; dy <= 1; dy++) {
                    int nx = x + dx, ny = y + dy;
                    if (nx < 0 or H <= nx or ny < 0 or W <= ny) continue;
                    if (not ok[nx][ny]) continue;
                    if (dp[nx][ny]) continue;
                    dp[nx][ny] = true;
                    que.emplace(nx, ny);
                }
            }
        }
        return dp[H - 2][W - 2];
    };

    if (not check()) {
        cout << 0 << '\n';
        return 0;
    }

    for (int i = 0; i < H; i++) {
        for (int j = 0; j < W; j++) {
            if (S[i][j] == '#') continue;
            S[i][j] = '#';
            if (not check()) {
                cout << 1 << '\n';
                return 0;
            }
            S[i][j] = '.';
        }
    }

    cout << 2 << '\n';
    return 0;
}