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

int main()
{

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int n;
    cin >> n;
    string result;
    cin >> result;

    int group = n / 10;
    int count = 0;

    int finalresult = 0;
    for (int i = 1; i <= n; i++)
    {
        if (result[i - 1] == 'T')
        {
            count++;
        }
        if (i % group == 0)
        {
            if (count == group)
            {
                finalresult++;
            }
            count = 0;
        }
    }
    cout << finalresult;
}