#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    int n,x,i,j;
    f>>n;
    x=2*n-1;
    for (i=2; i<=n; i++)
        for (j=1; j<=n; j++)
            if (i%j!=0 && j%i!=0)
                x++;
    g<<x;
    f.close();
    g.close();
    return 0;
}