#include<fstream.h>
unsigned long cmmdc(unsigned long a,unsigned long b)
{while(a!=b)
 if(a>b)
 a=a-b;
 else
 b=b-a;
 return a;} 
 
main()
{ifstream in("fractii.in.txt");
ofstream out("fractii.out.txt");
      unsigned long N,i,j,p=0;
      in>>N;
      for(i=1;i<=N;i++)
      for(j=1;j<=N;j++)
      if(cmmdc(i,j)==1)
      p=p+1;
      out<<p;
      in.close();
      out.close();
      }