#include<fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int n,i,k,x,y,s;
int main ()
{ f>>n;
s=n*2-1;
  for(i=1;i<=n;i++)
  { for(k=1;k<=n;k++)
   {
     if(k>i) {x=k; y=i;}
     if(k<=i) {x=i; y=k;}
     if(x%y!=0) { s=s+1;}
   }}
 g<<s;
 return 0; }