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#include <iostream>

using namespace std;

int main() {
    int n;
    cin >> n;
    int ntests = n/10, ngroups = 10;

    int score = 0;
    for (int i=0;i<ngroups;++i) {
        bool scored = true;
        for (int j=0;j<ntests;++j) {
            char c;
            cin >> c;
            if (c == 'N') {
                scored = false;
            }
        }
        if (scored) ++score;
    }

    cout << score << endl;
    return 0;
}