#include<fstream.h>
  int i,j,p,nr;
unsigned long N;
int main()   
 {ifstream fin("fractii.in");   
  ofstream fout("fractii.out");   
  fin>>N;   
  for(i=1;i<=N;i++)   
   for(j=1;j<=N;j++)   
     {p=1;   
       if(i%j==0 && j!=1 ) p=0;
	 else if(j%i==0 && j!=1&&i!=1) p=0;
	 if(p) {nr++;
		//cout<<i<<"/"<<j<<endl;
		}     
     }   
  fout<<nr;
  fin.close();   
 fout.close();
  return 0;   
 }