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#include <iostream>

using namespace std;

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	int n; cin>>n;
	string s; cin>>s;
	int step = n / 10;
	int res = 0;
	for(int i = 0; i < n; i += step)
	{
		int pts = 1;
		for(int j = i; j - i < step; j++)
			if(s[j] != 'T')
				pts = 0;
		res += pts;
	}
	cout<<res<<'\n';
	return 0;
}