#include<fstream.h>
int main()
{ifstream fin("fractii.in");
int n,s=0,i,j;
fin>>n;
fin.close();
for(i=1;i<=n;i++)
{for(j=1;j<=n;j++)
 {s++;
  if((i==j)&&(i>1)&&(j>1))s--;
  if((i>1)&&(i!=j)&&(j%i==0))s--;
  if((j>1)&&(i!=j)&&(i%j==0))s--;
 } }
ofstream fout("fractii.out");
fout<<s;
fout.close();
return 0;}