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#include <iostream>
#include <cstring>

using namespace std;

int main() {
    int x;
    cin >> x;
    string tnt;
    cin >> tnt;
    char a[x];
    strcpy(a, tnt.c_str());
    int kawalek = x / 10;
    int licz = 0;
    int score = 0;
    for (int i = 0; i < x; ++i) {
        if(i%kawalek==0){
            licz=0;
        }
        if (a[i] == 'T') {
            licz++;
        }
        else {
            licz = -1;
        }
        if (licz == kawalek) {
            score++;
            licz=0;
        }
    }
    cout<<score;
    return 0;
}