#include <iostream>
#include <fstream>

using namespace std;

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

int main()
{
    int n, r;
    f>>n;
    int k=2*n-1;
    for(int i=2;i<n;i++)
    {
        for(int j=2;j<=n;j++)
        {
            int a=i;
            int b=j;
            while(b!=0)
            {
                r=a%b;
                a=b;
                b=r;
            }
            if(a==1)
                k=k+2;
        }
    }
    g<<k;
    return 0;
}