/* 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 static void main (String[] args) throws java.lang.Exception
	{
		System.out.println(a(5, 9));
		System.out.println(a(91, 123));
		System.out.println(a(1, 10));
	}
	public static int a(int b,int c){int e=0,f=0;for(;b<=c;e+=b,f+=b*b++);return e*e-f;}
}

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