#include <iostream>
#include <cmath>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
long int v[2],n,i,j,s,d,m,k,a,b,c,nr;
int main()
{
    f>>n;
    /*for (i=2;i<=n;i++)
     {for (j=1;j<=n;j++)
     {nr++;
        if ((i%j==0) || (j%i==0)) nr--;}}*/

    for (i=2;i<=n;i++)
     {for (j=1;j<=n;j++)
     {
        a=i; b=j; if (j>a) {a=j; b=i;}
        if (a%b!=0) nr++;}}
    nr=nr+2*n-1;
    g<<nr;
    f.close(); g.close();
    return 0;

    }