#include<fstream.h>
   ifstream f("fractii.in");
   ofstream g("fractii.out");
   int main(void)
   {
   unsigned long int n,i,j,nr=1,ok,k,v;;
   f>>n; v=n;
   for(i=1;i<=n;i++)
   { for(j=2;j<=n;j++)
    { ok=1;
     if(i!=j)
      for(k=2;ok&&k<=i&&k<=j;k++)
         {if(i%k==0&&j%k==0) ok=0;}
    else ok=0;
  if(ok) nr++;
 }
 }
 g<<(nr+n);   f.close(); g.close();
 return 0;
 }