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

ifstream f("fractii.in");
ofstream g("fractii.out");

int cmmdc(int a , int b)
{
    int rest;
    while(b)
    {
      rest=a%b;
      a=b;
      b=rest;
    }
    return a;
}

int main()
{
    long long n, nrp=0, i, j;
    f>>n;
    if(n==1)
      cout<<1;
    else
        for(i=1;i<=n;i++){
          nrp++;
          for(j=2;j<=n;j++)
          {
            if(cmmdc(i,j)==1)
            nrp++;
          }
        }
    g<<nrp;
    return 0;
}