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#include <iostream>

int main() {
    uint64_t len;
    std::cin >> len;
    std::string in;
    std::cin >> in;

    uint64_t group_size = len / 10;
    uint64_t score = 0;
    for (uint64_t i = 0; i < 10; ++i) {
        bool ok = true;
        for (uint64_t j = 0; j < group_size; ++j) {
            if (in[i * group_size + j] != 'T') { ok = false; }
        }
        if (ok) { score += 1; }
    }
    std::cout << score << "\n";
}