#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int n,p,q,i,k,f;
int main()
{
    fin>>n;f=2*n-1;
    for(p=1;p<=n;p++)
    {
        for(q=1;q<=n;q++)
        if((p%q!=0)&&(q%p!=0))
        f++;
    }
    fout<<f;
    fin.close();
    fout.close();
    return 0;
}