/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public int d(int a,int b){int i=a,j,s=0;for(;i<=b;i++)for(j=a;j<=b;j++)s+=i==j?0:i*j;return s;}
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println(new Ideone().d(91,123));
	}
}