#include <iostream>
#include<fstream>
using namespace std;
int cmmdc(long a,long b)
{
 while(a!=b)
        if(a>b)
        a=a-b;
 else
    b=b-a;
 return a;
}
/*int nr_fractii()
{
    long n,i,j,s=0;
    for(i=1;i<=n;i++)
       for(j=1;i<=n;j++)
if(cmmdc(i,j)==1)
    s=s+2;
return s;    }*/
int main()
{
  ifstream fin("fractii.in");
  ofstream fout("fractii.out");
  long n,i,j,s=0;
fin>>n;
for(i=1;i<=n;i++)
       for(j=1;i<=n;j++)
        if(cmmdc(i,j)==1)
        s=s+2;
fout<<s;
    return 0;
}