#include<fstream>
using namespace std;

ifstream f("fractii.in");
ofstream g("fractii.out");

int main ()
{
	int n,i,j;
	f>>n;
	int c=2*n-1;
	for (i=2;i<=n;i++)
		for (j=2;j<=n;j++)
			if (i!=j)
				if((i%j!=0)&&(j%i!=0))
					c++;
	g<<c;
	return 0;
}