#include<fstream.h>
int dc(unsigned long a,unsigned long b)
{unsigned long r;
while(r)
 {r=a%b;
  a=b;
  b=r;
 }
 return a;
}
int main()
{unsigned long n,s,i,j;
ifstream f("fractii.in");
f>>n;
f.close();
s=0;
for(i=1;i<=n;i++)
 {for(j=1;j<=n;j++)
   if(dc(i,j)==1)s++;
 }
ofstream g("fractii.out");
g<<s<<'\n';
g.close();
return 0;
}