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//2022-12-12
//author: Marcin Rolbiecki
#include <bits/stdc++.h>
using namespace std;

int n, ans;
string s;

int main () {
		
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	cin >> n >> s;
	
	bool point = 1;
	for (int i = 1; i <= n; i++) {
		
		point &= (s[i-1] == 'T');
		
		if (i % (n/10) == 0) {
			ans += point;
			point = 1;
		}
	}
	
	cout << ans;
	
	return 0;
}