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#include <iostream>

using namespace std;


int main() {
    int testNo;
    cin >> testNo;
    string testResults;
    cin >> testResults;

    int result = 0;
    for (int i=0; i<10; i++) {
        bool groupOk = true;
        for(int j=0; j<(testNo/10); j++) {
           groupOk &= (testResults.at(i*(testNo/10)+j) == 'T');
        }
        if(groupOk)
            result++;
    }
    cout << result << endl;
}