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

int main() {
	int n;
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin >> n;
	int mod = n/10;
	int cnt = 0;
	int res =0;
	for(int i = 0; i < n; ++i) {
		if(!(i%mod)) cnt = 0;
		char c;
		cin >> c;
		if(c == 'T') cnt++;
		if(cnt == mod) res++;
	}
	cout << res;
}