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#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    string s;
    cin >> n >> s;
    int p = n / 10;
    int res = 0;
    for(int i = 0; i < 10; ++i) {
        bool correct = true;
        for(int j = 0; j < p; ++j)
            correct &= s[i * p + j] == 'T';
        res += correct;
    }
    cout << res << endl;
}