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#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define pb push_back
typedef pair <int, int> pii;
typedef long long ll;
typedef double db;

const int N = 1e5;

int n, res, m;
char c;
bool t;

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);	
	
	cin >> n;
	m = n / 10;
	for(int i=0; i<n; i++){
		if(!(i % m)){
			res += t;
			t = true;
		}
		cin >> c;
		t &= (c == 'T');
	}
	cout << res + t << "\n";
	
	return 0;
}