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// Mateusz Bogusławski
#include <iostream>

using namespace std;

int main() {
    int n, c = 0;
    string t;

    cin >> n >> t;

    bool tmp = true;
    for (int i = 0; i < n; i++) {
        if (t[i] == 'N') {
            tmp = false;
        }

        if ( (i+1) % (n/10) == 0 ) {
            if (tmp) {
                c++;
            }

            tmp = true;
        }
    }

    cout << c << endl;
}