#include "bits/stdc++.h"
#include <random>
#include <chrono>
#define ALL(x) (x).begin(), (x).end()
#define RALL(x) (x).rbegin(), (x).rend()
#define SZ(x) ((lint)(x).size())
#define FOR(i, begin, end) for(lint i=(begin),i##_end_=(end);i<i##_end_;++i)
#define IFOR(i, begin, end) for(lint i=(end)-1,i##_begin_=(begin);i>=i##_begin_;--i)
#define REP(i, n) FOR(i,0,n)
#define IREP(i, n) IFOR(i,0,n)
#define endk '\n'
using namespace std; typedef unsigned long long _ulong; typedef long long int lint; typedef double ld; typedef pair<lint, lint> plint; typedef pair<ld, ld> pld;
struct fast_ios { fast_ios() { cin.tie(nullptr), ios::sync_with_stdio(false), cout << fixed << setprecision(30); }; } fast_ios_;
template<class T> auto add = [](T a, T b) -> T { return a + b; };
template<class T> auto mul = [](T a, T b) -> T { return a * b; };
template<class T> auto f_max = [](T a, T b) -> T { return max(a, b); };
template<class T> auto f_min = [](T a, T b) -> T { return min(a, b); };
template<class T> using V = vector<T>;
using Vl = V<lint>; using VVl = V<Vl>; using VVVl = V<V<Vl>>;
template< typename T > ostream& operator<<(ostream& os, const vector< T >& v) {
    for (int i = 0; i < (int)v.size(); i++) os << v[i] << (i + 1 != v.size() ? " " : "");
    return os;
}
template< typename T >istream& operator>>(istream& is, vector< T >& v) {
    for (T& in : v) is >> in;
    return is;
}
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return 1; } return 0; }
template <class T>
T div_floor(T a, T b) {
    if (b < 0) a *= -1, b *= -1;
    return a >= 0 ? a / b : (a + 1) / b - 1;
}
template <class T>
T div_ceil(T a, T b) {
    if (b < 0) a *= -1, b *= -1;
    return a > 0 ? (a - 1) / b + 1 : a / b;
}
template <class F> struct rec {
    F f;
    rec(F&& f_) : f(std::forward<F>(f_)) {}
    template <class... Args> auto operator()(Args &&... args) const {
        return f(*this, std::forward<Args>(args)...);
    }
};
lint gcd(lint a, lint b) { if (b == 0) return a; else return gcd(b, a % b); }
lint digit(lint a) { return (lint)log10(a); }
lint e_dist(plint a, plint b) { return abs(a.first - b.first) * abs(a.first - b.first) + abs(a.second - b.second) * abs(a.second - b.second); }
lint m_dist(plint a, plint b) { return abs(a.first - b.first) + abs(a.second - b.second); }
bool check_overflow(lint a, lint b, lint limit) { if (b == 0) return false; return a > limit / b; } // a * b > c => true
void Worshall_Floyd(VVl& g) { REP(k, SZ(g)) REP(i, SZ(g)) REP(j, SZ(g)) chmin(g[i][j], g[i][k] + g[k][j]); }
const long long MOD1000000007 = 1000000007, MOD998244353 = 998244353, INF = 1e18;
lint dx[8] = { 0, 1, 0, -1, 1, -1, 1, -1 }, dy[8] = { 1, 0, -1, 0, -1, -1, 1, 1 };
bool YN(bool flag) { cout << (flag ? "YES" : "NO") << endk; return flag; } bool yn(bool flag) { cout << (flag ? "Yes" : "No") << endk; return flag; }
struct Edge {
    lint from, to;
    lint cost;
    Edge() {

    }
    Edge(lint u, lint v, lint c) {
        cost = c;
        from = u;
        to = v;
    }
    bool operator<(const Edge& e) const {
        return cost < e.cost;
    }
};
struct WeightedEdge {
    lint to;
    lint cost;
    WeightedEdge(lint v, lint c) {
        to = v;
        cost = c;
    }
    bool operator<(const WeightedEdge& e) const {
        return cost < e.cost;
    }
};
using WeightedGraph = V<V<WeightedEdge>>;
typedef pair<lint, plint> tlint;
typedef pair<ld, ld> pld;
typedef pair<plint, plint> qlint;
typedef pair<Edge, lint> pEd;
typedef pair<lint, Vl> vVl;
typedef pair<set<lint>, set<lint>> pset;

int main() {
    lint H, W;
    cin >> H >> W;
    V<string> arr;
    arr.push_back(string(W + 2, '#'));
    REP(i, H) {
        string s;
        cin >> s;
        s += "#";
        reverse(ALL(s));
        s += "#";
        reverse(ALL(s));
        arr.push_back(s);
    }
    arr.push_back(string(W + 2, '#'));

    VVl dp(H + 2, Vl(W + 2, INF));
    deque<plint> que;
    REP(i, H - 1) {
        dp[i + 3][0] = 0;
        que.push_back({ i + 3, 0 });
    }
    REP(i, W - 2) {
        dp[H + 1][i + 1] = 0;
        que.push_back({ H + 1, i + 1 });
    }
    while (!que.empty()) {
        auto [x, y] = que.front(); que.pop_front();
        FOR(dx, -3, 4) {
            FOR(dy, -3, 4) {
                if (abs(dx) + abs(dy) > 3) continue;
                lint nx = x + dx, ny = y + dy;
                if (nx < 0 || nx >= H + 2 || ny < 0 || ny >= W + 2) continue;
                if (nx < 4 && ny < 4) continue;
                if (H + 1 - nx < 4 && H + 1 - ny < 4) continue;
                if (arr[nx][ny] == '.') {
                    if (chmin(dp[nx][ny], dp[x][y] + 1)) {
                        que.push_back({ nx, ny });
                    }
                }
                if (arr[nx][ny] == '#') {
                    if (chmin(dp[nx][ny], dp[x][y])) {
                        que.push_front({ nx, ny });
                    }
                }
            }
        }
    }
    lint ans = INF;
    REP(i, H - 1) {
        chmin(ans, dp[i][W + 1]);
    }
    REP(i, W - 2) {
        chmin(ans, dp[0][i + 3]);
    }
    cout << ans << endk;
}