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

int CMMDC(int a, int b)
{
   int c;
     while(b!=0)                  //EUCLID
    {
        c=a%b;
        a=b;
        b=c;
    }
    return a;
}
int main()
{
    int N,i=2,S=0,j;
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    f>>N;
    f.close();
    while(i<=N)
    {
        j=2;
        while(j<=N)
        {
            if(CMMDC(j,i)<2) S++;
            j++;
        }

        i++;
    }
    g<<S+N+N-1;
    g.close();
    return 0;

}