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#include <iostream>

int main() {
    int n;
    std::string s;

    std::cin >> n;
    std::getline(std::cin, s);
    std::getline(std::cin, s);

    int SuccessCount = 0;
    int k = n / 10;
    for (int i = 0; i < 10; i++)
    {
        bool success = true;
        for (int j = 0; j < k; j++)
        {
            if (s[i*k + j] != 'T')
            {
                success = false;
            }
        }
        if (success) SuccessCount++;
    }

    std::cout << SuccessCount << "\n";

    return 0;
}