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#include <iostream>
int n;
using namespace std;
string tests;
int main() {
    cin >> n;
    cin >> tests;
    int counter = 0;
    for (int i = 0; i < n; i += (n/10)) {
        bool all_t = true;
        for (int j = 0; j < (n/10); j++) {
            if (tests[i+j] != 'T') {
                all_t = false;
                break;
            }
        }
        counter += (all_t ? 1 : 0);
    }
    cout << counter << endl;
}