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#include <bits/stdc++.h>
#define rep(i, a, b) for (int i = a; i <= b; i++)
#define per(i, a, b) for (int i = b; i >= a; i--)
#define cat(x) cout << #x << ": " << x << endl

using namespace std;
using ll = long long;

int main() {
	cin.tie(0)->sync_with_stdio(0);

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

	int res = 0;
	rep(i, 0, 9) {
		res += count(s.begin() + n / 10 * i, s.begin() + n / 10 * (i + 1), 'T') == n / 10;
	}
	cout << res << "\n";

	return 0;
}