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#include <iostream>
using namespace std;

int main() {
	int n;
	cin >> n;
	int res = 0, tmpRes = 0;
	int testSize = n / 10;
	int testCounter = 0;
	int i = 0;
	char tmpVal;
	while (i < n) {
		while (testCounter < testSize) {
			++testCounter;
			++i;
			cin >> tmpVal;
			if (tmpVal == 'T') {
				++tmpRes;
			}
		}
		
		if (tmpRes == testSize) {
			++res;
		}
		
		tmpRes = 0;
		testCounter = 0;
	}
	
	cout << res;
	return 0;
}