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

int cmmdc(int a,int b)
{
     int r;
     while (b!=0)
     {
         r=a%b;
         a=b;
         b=r;
     }
     return a;
}

int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    int N,rez,p,q;
    f>>N;
    rez=N;
    for(p=2;p<=N;p++)
        for(q=1;q<=N;q++)
         if(cmmdc(p,q)==1)
            rez++;
    g<<rez;
}