#include <iostream>
#include <fstream>

using namespace std;

ifstream f("fractii.in");
ofstream g("fractii.out");

int main()
{
    int i,j,n,fractii,k;

    f>>n;
    fractii = n*n;

    for (i=2;i<=n;i++)
    {
        for (j=2;j<=n;j++)
        {
            if (max(i,j)%min(i,j)==0)
            {
                if (i==j)
                    fractii--;
                else
                    fractii-=2;
            }
        }
    }
    g<<fractii;
    return 0;
}