#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
long N;
int i,j,sol;
long cmmdc (long x, long y) {
while (x!=y)
    if (x>y) x=x-y;
    else y=y-x;
    return x;
}
int main()
{ f>>N;
  sol=N;
  for (i=2;i<=N;i++)
    for (j=1;j<=N;j++)
     if (cmmdc(i,j)==1) sol++;
  g<<sol;
  f.close();
  g.close();

    return 0;
}