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

int main() {
    int n;
    cin >> n;
    string s;
    cin >> s;
    int ans = 0;
    for (int i = 0; i < 10; i++) {
        bool this_set = true;
        for (int j = 0; j < n / 10; j++) {
            if (s[n / 10 * i + j] == 'N')
                this_set = false;
        }
        ans += this_set;
    }
    cout << ans << "\n";
    return 0;
}