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#include <iostream>

int main() {
    std::ios::sync_with_stdio(false);

    int n; 
    std::cin >> n;

    int group_size = n / 10;

    int result = 0;
    char c;
    bool correct;
    for (int i = 0; i < n; ++i) {
        std::cin >> c;
        if (i % group_size == 0) {
            correct = true;
        }
        correct = correct && (c == 'T');
        if ((i % group_size == group_size - 1) && correct) {
            result += 1;
        }
    }
    std::cout << result << std::endl;
}