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

int main() {
    int n_tests;
    cin >> n_tests;

    int points = 0;

    int tests_to_pass = n_tests / 10;

    for (int i = 0; i < n_tests/tests_to_pass; i++) {
        bool did_pass = true;
        for (int j = 0; j < tests_to_pass; j++) {
            char test;
            cin >> test;
            if (test == 'N') did_pass = false;
        }

        if (did_pass) points++;
    }

    cout << points << endl;
}