using namespace std;
#include<fstream>
int main()
{
	int i,j;
	float ii,jj,k,nr;
	fstream fis("fractii.in",ios::in);
	fis>>nr;
	fis.close();
	k=nr*nr;
	for(i=1;i<=nr;i++)
	{
		ii=i;
		for(j=1;j<=nr;j++)
		{
			jj=j;
			if(ii>jj)if(i%j!=0)k=k-1;
			if(ii<jj)if(j%i!=0)k=k-1;
		}
	}
	fstream fiss("fractii.out",ios::out);
	fiss<<k;
	fiss.close();
}