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

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);

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

	int cnt = 0;
	int result = 0;

	for(int i=0;i<n;i++) {
		cnt += (s[i] == 'T' ? : 0);
		if(i%(n/10) == n/10-1) {
			result += (cnt == n/10 ? 1 : 0);
			cnt = 0;
		}
	}

	cout << result << "\n";

	return 0;
}