#include <fstream.h>
ifstream f("fractii.in");
ofstream g("fractii.out");
int cmmdc(long a,long b)
{if (b==0) return a;else return cmmdc(b,a%b);}
int main()
{long n,nr,i,j;
f>>n;nr=0;
for (i=1;i<=n;i++)
   for (j=1;j<=n;j++)
      if (cmmdc(i,j)) nr++;
g<<nr;}