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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, ans = 0;
	string s;
	
	cin >> n >> s;
	
	int part = n/10;
	
	for(int i=0; i<n; i+=part){
		int act = part;
		for(int j=i; j<i+part; j++){
			if(s[j] == 'T') act--;
		}
		if(act) continue;
		ans++;
	}
	
	cout << ans << '\n';
	
	return 0;
}