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#include<cstdio>
using namespace std;
int main()
	{
	int n,t,p=0;
	scanf("%d",&n);
	t=n/10;
	bool ok=1;
	int i=0;
	char c;
	while(n--)
		{
		++i;
		if(i%t==0)
			{
			if(ok)p++;
			ok=1;
			}
		scanf("%c%",&c);
		ok=ok&&c=='T';
		}
	printf("%d\n",p);
	return 0;
	}