#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main()
{
    ll x, y;
    cin >> x >> y;
    ll ans = y + 1;
    vector<vector<char>> z1(x);
    for (int i = 0; i < x; i++)
    {
        for (int j = 0; j < y; j++)
        {
            char w;
            cin >> w;
            z1.at(i).push_back(w);
        }
    }
    for (int i = 0; i < y; i++)
    {
        for (int j = 0; j < x; j++)
        {
            if (z1.at(j).at(i) != '_')
            {
                ans -= 1;
                break;
            }
        }
    }
    cout << ans << endl;
    return 0;
}