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

string s;

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	int a = 0, b = 0, n, wyn = 0;
	cin>>n>>s;
	n /= 10;
	for(int i=0; i<s.size(); i++)
	{
		if(s[i] == 'T') a++;
		b++;
		if(b == n)
		{
			if(a == n) wyn++;
			a = b = 0;
		}
	}
	cout<<wyn;
	return 0;
}