#include <iostream>
#include <fstream>
using namespace std;

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

int main()
{
    int n,p,q,s,r=0,a,b,w;

    f>>n;
    s=n*2-1;
    for(p=2;p<=n;p++)
        for(q=p+1;q<=n;q++)
        {
            a=q;
            b=p;
            while(b)
            {
                w=a%b;
                a=b;
                b=w;
            }
            if(a==1)
                r++;
        }


    g<<s+2*r;
    return 0;
}