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#include <iostream>

using namespace std;

int main() {

    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int n;
    string s;
    cin >> n >> s;

    int res = 0;

    int x = n/10;
    for (int i = 0; i < 10; i++) {
        int tmp = 0;
        for (int j = 0; j < x; j++) {
            if (s[i * x + j] == 'T') {
                tmp++;
            }
        }
        if (tmp == x) {
            res++;
        }
    }

    cout << res << endl;

}