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#include <bits/stdc++.h>
using namespace std;

int main(){
	int n;
	cin >> n;
	char a;
	
	int wyn = 0, pom, m = n/10;
	for (int i = 0; i < 10; ++i){
		pom = 0;
		for (int j = 1; j <= m; ++j){
			cin >> a;
			if (a == 'T')
				++pom;
		}
		if (pom == m) ++wyn;
	}
	cout << wyn;
}