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#include <iostream>
#include <string>
using namespace std;

int n, cntr = 0, sv = 0, otp = 0;
string s;

int main()
{
    cin >> n;
    cin >> s;

    sv = n / 10;

    for (int i = 0; i < n; i++)
    {
        if (s[i] == 'T')
        {
            cntr++;
        }
        else
        {
            cntr = 0;
        }

        if (cntr == sv)
        {

            cntr = 0;
            otp++;
        }
    }

    cout << otp;

return 0;
}