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#include<iostream>
using namespace std;

int main() {
    int n;

    cin >> n;

    int testsInGroup = 0;

    int result = 0;

    int step = n / 10;

    for (int i = 1; i <= n; i++) {
        char c;
        cin >> c;
        if (c == 'T') testsInGroup++;
        if (i % step == 0 && testsInGroup == step) {
            result++;
        } else if (i % step == 0) {
            testsInGroup = 0;
        }
    }

    cout << result << endl;
    return 0;
}