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#include <iostream>

using namespace std;

int main()
{
    int N;
    cin >> N;

    bool* Tests = new bool[N];
    for (int t = 0; t < N; t++)
    {
        char c;
        cin >> c;

        Tests[t] = c == 'T';
    }

    int Result = 0;
    for (int g = 0; g < 10; g++)
    {
        bool IsPoint = true;
        for (int t = 0; t < N / 10; t++)
            if (!Tests[g * N / 10 + t])
            {
                IsPoint = false;
                break;
            }

        Result += IsPoint;
    }
    delete[] Tests;

    cout << Result;

    return 0;
}