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

int n;
string S;

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cin >> n;
	cin >> S;
	int res = 0;
	int jmp = n / 10;
	for (int i = 0; i < 10; i++) {
		bool ok = true;
		for (int j = 0; j < jmp; j++) {
			ok &= (S[jmp * i + j] == 'T');
		}
		res += ok;
	}
	cout << res << "\n";
}