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#include <iostream>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false); cin.tie(0);
    string s;
    int n, r = 10;
    cin >> n;
    cin >> s;
    for (int i = 0; i < n; i += n / 10) {
        for (int j = i; j < i + n / 10; j++) {
            if(s[j] == 'N') {
                r--;
                break;
            }
        }
    }
    cout << r << "\n";
    return 21/37;
}