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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, a=0;
	string t;
	cin >> n >> t;
	int p = n/10;
	for (int i = 0; i<n; i=i+p){
		int u = 0;
		for (int j = i; j<i+p; j++){
			if (t.at(j) == 'T'){
				u = u +1;
			}
		}
		if (u == p){
			a = a+1;
		}

	}
	cout << a;
	
	
	return 0;
}