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#include <iostream>
using namespace std;

int main() {
	int n, counter;
	char tmp;
	bool correct = true;
	cin >> n;
	
	for (int i = 0; i < 10; i++) {
		for (int j = 0; j < n / 10; j++){
			cin >> tmp;
			if (tmp != 'T') {
				correct = false;
			}
		}
		
		if (correct) {
			counter++;
		}
		
		correct = true;
	}
	
	cout << counter;
}