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#include <iostream>
#include <string>
#include <fstream>

using namespace std;


#ifdef USE_FILE_CIN
ifstream input("pun.in");
#define cin input
#endif


int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n, groupSize;
    string results;
    int points = 0;

    cin >> n >> results;
    groupSize = n / 10;

    for (int i = 0; i < n; i += groupSize) {
        int tCount = 0;
        for (int j = 0; j < groupSize; j++) {
            tCount += results[j + i] == 'T';
        }

        if (tCount == groupSize) {
            points ++;
        }
    }

    cout << points;

    return 0;
}