#include<fstream.h>
int n,i,j,a,b,r,k;
int main()
{
ifstream f("fractii.in");
ofstream g("fractii.out");
f>>n;
k=2*n-1;
for(i=2;i<=n;i++)
for(j=i+1;j<=n;j++)
	{a=i;b=j;r=0;
	while(b!=0)
		{r=a%b;
		a=b;b=r;}
	if(a==1)
		k+=2;
	}
g<<k;
f.close();
g.close();
return 0;
}