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

int main() {
    int n;
    cin >> n;
    string s;
    cin >> s;
    int res = 0;
    for (int i = 0; i < n; i += n / 10) {
        res += s.substr(i, n / 10) == string(n / 10, 'T');
    }
    cout << res << endl;
}