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#include <bits/stdc++.h>

using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, res=0;
    char c;
    bool ok;

    cin >> n;
    const int pack = n / 10;

    for (int i = 0; i < n;) {
        ok = true;
        for (int j = 0; j < pack; ++j) {
            cin >> c;
            i++;
            if (c == 'N') ok = false;
        }
        if (ok) res++;
    }

    cout << res <<"\n";
}