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

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

int nr_prime(int a, int b)
{
    int r;
    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    if(a==1) return 1;
    else return 0;
}

int main()
{
   unsigned int n, nr, i, j;
   fin>>n;
   nr=n;
   for(i=2; i<=n; i++)
        for(j=1; j<=n; j++)
            if(nr_prime(i,j)==1) nr++;
    fout<<nr;

}