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#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    bool isOK = true;
    int res = 0;
    for (int i = 1; i <= n; i++) {
        char c;
        cin >> c;
        if (c != 'T') isOK = false;
        if (i % (n / 10) == 0) {
            res += isOK;
            isOK = true;
        }
    }
    cout << res;
}