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