#include <iostream>
#include <fstream>

using namespace std;

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