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#include <iostream>
using namespace std;
int main()
{
	int n, w = 0;
	bool g = 1;
	string s;
	cin>>n>>s;
	for (int i = 0; i < n; i ++)
	{
		g = min(g, s[i] == 'T');
		if ((i + 1) % (n / 10) == 0)
		{
			w += g;
			g = 1;
		}
	}
	cout<<w<<'\n';
}