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

string tests;
long sec = 0;
int n;

int main()
{
    cin >> n;
    cin >> tests;
    int gr = n / 10, pkt = 0;
    for (int i = 0; i < 10; i++)
    {
        bool t = true;
        int j = 0;
        while ((t == true) && (j < gr))
        {
            if (tests[i * gr + j++] != 'T')
                t = false;
        }
        if (t == true)
            pkt++;
    }

    cout << pkt;
    return 0;
}