#include <iostream>
#include <fstream>
using namespace std;
int n,nr,a,b,k,x,y;
int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    f>>n;
    a=2;b=1;
    nr=n;
    while (a<=n)
    {
        while (b<=n)
        {
            k=0;
            if (b==1) nr++;
            else if ((a%2==0) and (b%2==0)) k=1;
            else if ((a>b) and (a%b!=0) and (k==0)) nr++;
            else if ((a<b) and (b%a!=0) and (k==0)) nr++;
            b++;
        }
        a++;
        b=1;
    }
    g<<nr;
    return 0;
}