#include <iostream>
#include <cstdio>
using namespace std;
int x,y,i,nr;
int main()
{
    freopen("fractii.in","r",stdin);
    freopen("fractii.out","w",stdout);
    scanf("%d",&i);
    for(x=2;x<=i;x++)
    {
        for(y=2;y<=i;y++)
        {
            if(y%x==0||x%y==0)
            {
                nr++;
            }
        }
    }
    i*=i;
    i-=nr;
    printf ("%d",i);
    return 0;
}