#include<iostream.h>
#include<fstream.h>
fstream f("fractii.in",ios::in);
fstream g("fractii.out",ios::out);
long main()
{
long n,i,p=0,k=0,a,b,rest,o=0,j;
f>>n;
for (i=1;i<=n;i++)
	     if (i%2==1) p++;
k=n+p;
for (i=3;i<=n;i++)
	     for (j=1;j<=n;j++)
		      {
		      a=i;
		      b=j;
		      while (a!=b)
		      {
		      if (a>b) a=a-b;
		      if (a<b) b=b-a;
		      }
		      if (a==1) o++;
		      }
g<<k+o;
return 0;
}