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

int main() {
    cin.tie(0); ios_base::sync_with_stdio(false);
    int n; cin >> n;
    string s;
    cin >> s;
    bool valid = true;
    int group_length = n / 10;
    int it = 0;
    int res = 0;
    for (int i = 0; i < s.size(); i++) {
        it++;
        if (s[i] == 'N') valid = false;
        if (it == group_length) {
            it %= group_length;
            if (valid) {
                res++;
            }
            valid = true;
        }
    }    
    cout << res;
}