#include <iostream>
#include<fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");


int cmmdc(int a,int b)
{
    int c;
    while(b)
    {
        c=a%b;
        a=b;
        b=c;
    }
    return a;
}
int main()
{
    int N,i,j,nr;
    f>>N;
    nr=2*N-1;
    for(i=2;i<=N;i++)
    {
        for(j=2;j<=N;j++)
        {
            if(cmmdc(i,j)==1)
            {
                nr++;
            }

        }
    }
    g<<nr;
}