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#include <bits/stdc++.h>


using namespace std;


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

    int n;
    cin >> n;

    string s;
    cin >> s;

    int groupSize = n / 10, ans = 0;
    for (int group = 0; group < 10; group++) {
        bool ok = true;
        for (int i = groupSize * group; i < groupSize * (group + 1); i++) {
            if (s[i] == 'N') {
                ok = false;
                break;
            }
        }

        ans += ok;
    }

    cout << ans;

    return 0;
}