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#include <bits/stdc++.h>
using namespace std;
signed main()
{
	int n;
	string s;
	cin >> n >> s;
	int ans=0;
	for(int i=0;i<n;i+=n/10)
	{
		string t=s.substr(i,n/10);
		++ans;
		for(auto x:t)
		{
			if(x!='T')
			{
				--ans;
				break;
			}
		}
	}
	cout << ans;
	return 0;
}