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#include <bits/stdc++.h>
using namespace std;
signed main(){
	int n;
	cin>>n;
	int len = n/10;
	int res = 0;
	for(int block = 0;block<10;block+=1){
		bool flag = 1;
		for(int i = 0;i<len;i+=1){
			char val;
			cin>>val;
			flag = min(flag,val=='T');
		}
		res += flag;
	}
	cout<<res<<endl;
}