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

int main(){
int n,wynik=0; cin >> n;
string in; cin >> in;
int m=n/10;
for (int i=0; i<n;){
int tmp=0;
for(int j = i+m; j>i; i++){
if (in[i]=='T') tmp++;
}
if (tmp==m) wynik++;
}
cout << wynik;
}