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// potyczki.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <algorithm>
#include <vector> 

using namespace std;


int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n;
    string s;
    cin >> n;
    cin >> s;
    int zes = n / 10;
    int licz = 0;
    int wyn = 0;
    for (int i = 0; i < n/zes; i++)
    {
        for (int j = 0; j < zes; j++)
        {
            int nr = (i * zes) + j;
            char c = s[nr];
            if (c == 'T')
                licz++;
        }
        if (licz == zes)
            wyn++;
        licz = 0;
    }
    cout << wyn;
}