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#include <iostream>
#include <string>

using namespace std;

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

    int count;
    cin >> count;
    int result = 0;
    int testsInGroup = count / 10;
    for(int group = 0; group < 10; group++) {
        bool passed = true;
        for(int test = 0; test < testsInGroup; test++) {
            char score;
            cin >> score;
            if(score!='T') {
                passed = false;
            }
        }
        if(passed) {
            result++;
        }
    }
    cout << result << "\n";
    return 0;
}