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#include <iostream>

using namespace std;

int n, a, wynik = 0;
bool ok;
string s;

int main()
{
    cin >> n >> s;
    a = n / 10;
    for(int i = 0; i < n; i += a)
    {
        ok = true;
        for(int j = 0; j < a; j++)
        {
            if(s[i + j] != 'T')
            {
                ok = false;
                break;
            }
        }
        if(ok)
            wynik++;
    }
    cout << wynik;
    return 0;
}