/*
TASK:necklace
LANG:C++
*/
#include <iostream.h>

int main()
{
	int n,i,br=-1,gg,g,o,e;
	cin>>n;
	e=n/2;
	o=n-e;
	cout<<"\n"<<e<<"<>"<<o<<"\n";
	while(e>=0)
	{
		for(i=0;i<e+1;i++)
			br+=i*(e+1-i);
		e-=3;
		br++;
		}
	cout<<br<<"\n";
	return 0;
}
