/* 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;}
{
System.
out.
println(new Ideone
().
d(91,
123)); }
}
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