#include<stdio.h>
int cmmdc(int a,int b)
{
    int r;
    while(b)
    {
     r=a%b;
     a=b;
     b=r;
    }
   return a;
}
int main()
{
 freopen("fractii.in","r",stdin);
 freopen("fractii.out","w",stdout);
 
 
 int n;
 scanf("%d",&n);
 int i,j,nr=0;
 for(i=1;i<=n;i++)
   for(j=1;j<=n;j++)
   {
              if(cmmdc(i,j)==1)
                   nr++;      
   }
 printf("%d",nr);
 return 0;
}