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#include <bits/stdc++.h>

using namespace std;

typedef int ll;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    ll n;
    cin >> n;
    ll wielkoscGrup = n / 10;
    ll ans = 0;
    ll witch = 1;
    bool passed = true;
    for (ll i = 0; i < n; i++) {
        char c;
        cin >> c;
        if (c == 'N') {
            passed = false;
        }
        if (witch == wielkoscGrup) {
            if (passed) {
                ans++;
            }
            witch = 1;
            passed = true;
        } else {
            witch++;
        }
    }
    cout << ans << endl;
    return 0;
}