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

int sum=0, j;

int main()
{
	int a;
	cin>>a;
	string b;
	cin>>b;
	for(int i=0; i<a; i+=a/10)
	{
		j=i;
		while(b[j]=='T'&&j<i+(a/10))
		{
			++j;
		}
		if(j==i+(a/10))
		{
			 ++sum;	
		}
	}
	cout<<sum;
	return 0;
}