#include <fstream>

using namespace std;

ifstream fin("fractii.in");
ofstream fout("fractii.out");

int main()
{
    int n,i,ct,j,a,b;
    int x;
    fin>>n;
    ct=2*n-1;
    for (i=2; i<=n; i++)
    {
        a=i;
        for (j=2; j<=n; j++)
        {
            b=j;
            x=i%j;
            while (x!=0)
            {
                a=b;
                b=x;
                x=a%b;
            }
            if (b==1)
            {
             ct++;
            }
        }
    }
    fout<<ct;

}