#include <iostream>
#include <vector>
using namespace std;

int x, y;
vector<vector<char>> g;  
vector<vector<bool>> v;  
int dx[] = {-1, 1, 0, 0};
int dy[] = {0, 0, -1, 1};
void dfs(int i, int j) {
    if (i < 0 || i >= x || j < 0 || j >= y) return;
    if (v[i][j] || g[i][j] == '*') return;
    
    v[i][j] = true;
    for (int k = 0; k < 4; k++) {
        dfs(i + dx[k], j + dy[k]);
    }
}

int main() {
    cin >> x >> y;
    g.resize(x, vector<char>(y));
    v.resize(x, vector<bool>(y, false));
    for (int i = 0; i < x; i++) {
        for (int j = 0; j < y; j++) {
            cin >> g[i][j];
        }
    }
    
   
    for (int i = 0; i < x; i++) {
        if (g[i][0] == '0' && !v[i][0]) dfs(i, 0);
        if (g[i][y-1] == '0' && !v[i][y-1]) dfs(i, y-1);
    }
    for (int j = 0; j < y; j++) {
        if (g[0][j] == '0' && !v[0][j]) dfs(0, j);
        if (g[x-1][j] == '0' && !v[x-1][j]) dfs(x-1, j);
    }

    int cnt = 0;  
    for (int i = 0; i < x; i++) {
        for (int j = 0; j < y; j++) {
            if (g[i][j] == '0' && !v[i][j]) {
                cnt++;
            }
        }
    }
    
    cout << cnt << endl;
    return 0;
}    
/**************************************************************
	Problem: 1913
	User: caizhihao
	Language: C++
	Result: Accepted
	Time:28 ms
	Memory:2212 kb
****************************************************************/