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

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int n;
	cin >> n;
	string s;
	cin >> s;
	s+='N';
	//cout<<s;
	int z = n/10, l = 0, w = 0;
	for(int i = 0; i < n+1; i++){
		if(i%z == 0){
			if(l == z)w++;
			l = 0;
		}
		if(s[i] == 'T')l++;
	}
	cout<<w;
	return 0;
}