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#include <iostream>

using namespace std;

int main() {
    int n; cin >> n;
    string line; cin >> line;
    int group_size = n / 10;
    int groups_passed = 0;
    int i = 0;
    while (i < n) {
        int group_passed = 1;
        for (int j = 0; j < group_size; ++j) {
            if (line[i] != 'T') {
                group_passed = 0;
            }
            i++;
        }
        groups_passed += group_passed;
    }
    cout << groups_passed << endl;
    return 0;
}