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#include <bits/stdc++.h>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int n;
    cin >> n;
    int res = 0;
    for (int i = 0; i < 10; ++i) {
        bool success = true;
        for (int j = 0; j < n / 10; ++j) {
            char c;
            cin >> c;
            if (c == 'N') success = false;
        }
        res += success;
    }
    cout << res << endl;
}