#include <iostream>
#include <fstream>
using namespace std;
int nr,n,i,j;
int div(int a,int b)
{int r;
    r=a%b;
    while(r!=0)
    {
        a=b;
        b=r;
        r=a%b;
    }
    if(b==1)return 1;
    else return 0;
}
int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    f>>n;
    nr=n*2-1;
    for(i=2;i<=n-1;i++)
       for(j=i+1;j<=n;j++)
        if(div(i,j)==1)nr=nr+2;
        g<<nr;
}