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#include <iostream>

using namespace std;
/**
20
TTNNTTNTNTNNNNNNNNTT

 50
 TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT

  50
 NTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTN
 */
int main() {
    int n;
    scanf("%d", &n);
    string str;
    cin >> str;

    int points = 0;
    int index = 0;
    for(int i = 0; i < 10; i++) {
        bool all_correct = true;
        for(int y = 0; y < (n / 10); y++) {
            if(str[index++] != 'T') {
                all_correct = false;
            }
        }
        if(all_correct) {
            points++;
        }
    }

    cout << points << endl;

    return 0;
}