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/******************************************************************************

                              Online C++ Compiler.
               Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.

*******************************************************************************/

#include <iostream>

using namespace std;

int main() 

{
    int n = 0;
    int grupy = 10;
    int ilosc = 0;
    string wejscie;
    
    cin >> n;
    cin >> wejscie;
    
    ilosc = n/grupy;
    int wynik = 0;
    for (int i = 0; i < grupy; i++){
    int sumaT = 0; 
        for (int j=0; j<ilosc; j++){
            if (wejscie[i * ilosc + j] == 'T' ){
                sumaT++;
            }
            
        }
        if (sumaT == ilosc){
            wynik++;
        }
    }
    cout << wynik ;
    return 0;
}