//11417
#include<iostream>
#include<cstdlib>
#include<stdio.h>
#include<vector>
#include<algorithm>
#include<math.h>
#include<ctype.h>
using namespace std;
int gcd(int a,int b)
{
if(b==0)
return a;
else
return gcd(b,a%b);
}
int main()
{
int g;
int i,j,n;
while(scanf("%d",&n)==1)
{
if(n==0)
break;
g=0;
for(i=1;i<n;i++)
{
for(j=i+1;j<=n;j++)
g+=gcd(i,j);
}
printf("%d\n",g);
}
}