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#include <bits/stdc++.h>

using namespace std;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);
	int n;
	cin >> n;
	string s;
	cin >> s;
	int m = n / 10, ans = 0;
	for (int i = 0; i < 10; ++i) {
		int c = 0;
		for (int j = i * m; j < (i + 1) * m; ++j) {
			c += (s[j] == 'T');
		}
		if (c == m) ++ans;
	}
	cout << ans << '\n';
}