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#include <iostream>
using namespace std;

int main() {
    int n;
    cin >> n;
    string s;
    cin >> s;
    int r = 0;
    for (int i = 0; i < 10; i++){
        bool ok = true;
        for (int j = i * n / 10; j < (i + 1) * n / 10; j++) {
            if (s[j] == 'N') {
                ok = false;
            }
        }
        if (ok) {
            r++;
        }
    }
    cout << r << "\n";
}