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
	{
		// your code goes here
		//For finding the minimum sum of two arrays
		int a1=2,a2=3; // Strictly increasing (ascending)
		int b1 =7,b2=5; // descending
 
 
	    int d = (a1-a2)*(b1-b2);
 
		//Shortcut for d = (a4-a2)(b2-b4) >=0
 
		System.out.println(d);
	}
}
 

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