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

const int D = 10;

int solve(int n, string s) {
    int score = 0;
    int m = s.size() / D;

    bool allPassed = true;

    for (int i = 0; i < n; i++) {
        if (s[i] == 'N') {
            allPassed = false;
        }

        if ((i + 1) % m == 0) {
            if (allPassed) {
                score++;
            }
            allPassed = true;
        }
    }

    return score;
}

int main() {
    ios_base::sync_with_stdio(false);

    int n;
    cin >> n;
    string s;
    cin >> s;

    cout << solve(n, s) << endl;
}