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

int main()
{
    int n,p,q,s;
    ifstream ka("fractii.in");
    ofstream ki("fractii.out");
    ka>>n;
    s=2*n-1;
    for(p=2;p<=n;p++)
    {
        for(q=2;q<=n;q++)
        {
            if((q%p!=0)and(p%q!=0))
            s++;
        }
    }
    ki<<s;
}