#include<iostream>
#include<fstream>
#include<math.h>
using namespace std;

ifstream f("fractii.in");
ofstream g("fractii.out");

int par(int k,int n)
{
    int nr=0;
    int i=2.0;

    while(i<=n)
    {
        if((int)i%2==0)
          {
             nr++;
             //cout<<i<<" ";
          }
        else if(i%k!=0&&k%i!=0)
            {
             nr++;
            // cout<<i<<" ";
          }
        i++;
    }
    return nr;

}
int impar(int n)
{
    int nr=0,i=2;
    while(i<=n)
    {
        if(i%2==1)
             {
             nr++;
             //cout<<i<<" ";
          }
        i++;
    }
    return nr;

}
int cmmdc(int a,int b)
{
    int r;
    r=a%b;
    while(r)
    {
        a=b;
        b=r;
        r=a%b;
    }
    return b;
}
int main()
{
    int n,nr,i;
    //cout<<"n=";cin>>n;
   f>>n;
    nr=n+n-1;
    for(i=2;i<=n;i++)
    for(int j=2;j<=n;j++)
        if(cmmdc(i,j)==1)
            nr++;


g<<nr;
  //cout<<nr;
    return 0;
}