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

int main() {
    ios_base::sync_with_stdio(0);
    int n;
    string S;
    cin >> n >> S;
    int len = n/10, res = 0;
    for(int i=0;i<n;i+=len) res += all_of(S.begin() + i, S.begin() + i + len, [](auto x){return x=='T';});
    cout << res << '\n';
    return 0;
}