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


int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);

	int n;
	cin >> n;
	string s;
	cin >> s;

	int res = 0;
	int size = n / 10;
	for (int grp = 0; grp < 10; grp++) {
		bool dobre = true;

		for (int i = 0; i < size; i++) {
			dobre &= s[grp * size + i] == 'T';
		}

		res += dobre;
	}

	cout << res << "\n";
}