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