#include <iostream>
#include "bits/stdc++.h"

using namespace std;
int n;
string s;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n >> s;
    int ans = 0;

    for (int i = 0; i < n; ++i) {
        bool all = true;
        for (int j = 0; j < n / 10; ++j) {
            if (s[i] == 'N') {
                all = false;
            }
            i++;
        }
        i--;
        if (all) {
            ans++;
        }
    }

    cout << ans;

    return 0;
}