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//dzien1 - C
#include <bits/stdc++.h>
using namespace std;

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	
	int n;
	cin>>n;
	string s;
	cin>>s;
	
	int x = n/10;
	int result = 0;
	
	for(int i=0; i<n; i+=x)
	{
		bool check = false;
		for(int j=0; j<x; j++)
		{
			if(s[i+j] == 'T') continue;
			else {check = true; break;}
		}
		if(check == false) result++;
	}

	cout<<result;

	return 0;
}