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#include <iostream>
#include<vector>
#include<tuple>
#include <algorithm>
using namespace std;

int n;
string a;


void solve() {
    cin >> n;

    cin >> a;

    int Wynik = 0;
    int x = n / 10;
    bool ok = true;

    for (int i = 0; i < n; ++i) {
        if (a[i] == 'N') {
            ok = false;
        }
        if ((i + 1) % x == 0) {
            if (ok) {
                Wynik++;
            }
            ok = true;
        }
    }

    cout << Wynik << endl;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int t = 1;
    //cin >> t;
    while (t--) solve();

    return 0;
}