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#include <iostream>

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(NULL);
    
    int n;
    std::string s;
    std::cin >> n >> s;
    
    bool good = true;
    int points = 0;
    for (int i=0; i<n; i++) {
        good = good && (s[i] == 'T');
        if ((i+1) % (n/10) == 0) {
            if (good) {
                points++;
            }
            good = true;
        }
    }

    std::cout<< points << "\n";
}