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#include<iostream>
#include<string>
using namespace std;

int main() {
    int n;
    string s;
    cin >> n >> s;
    int k = n / 10, cnt = 0, res = 0;
    for (int i = 0; i < s.size(); i++) {
        if (s[i] == 'T') {
            cnt++;
        }
        if (i % k == k - 1) {
            if (cnt == k) {
                res++;
            }
            cnt = 0;
        }
    }
    cout << res;

    return 0;
}