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#include <bits/stdc++.h>

using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int n; cin >> n;
    string s; cin >> s;
    int sum = 0, m = n/10;
    for (int i = 0; i < 10; ++i) {
        bool good = true;
        for (int j = 0; j < m; ++j)
            good &= (s[m * i + j] == 'T');
        sum += good;
    }
    cout << sum << '\n';
}