#include<iostream.h>   
#include<fstream.h>   
ifstream(f);   
ofstream(g);   
int main()
{   
f.open("fractii.in");   
g.open("fractii.out");   
long int n;   
long long int s;
f>>n;
s=2*n-1;
for(int i=2;i<=n;i++)
{for(int j=2;j<=n;j++)
{
if (i!=j&&(i%j!=0||j%i!=0))
{
int a=i,b=j;
while(0==0)
{int r=a%b;
if (r==0) break;
a=b;
b=r;}
   if(b==1) s++;}}
}
g<<s;
f.close();
g.close();
return 0;   
}