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

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	
	int n;
	cin >> n;
	
	string tests;
	cin >> tests;
	
	int podtest = n / 10;
	int counter = 0;
	int res = 0;
	for(int i = 0; i < n; i++){
		if(i % podtest == 0){
		    if(counter == podtest)
		        res++;
		    counter = 0;
		}
		if(tests[i] == 'T')
			counter++;
	}
	if(counter == podtest)
	    res++;
	cout << res << '\n';
	return 0;
}