JAVA 代码

import java.util.Scanner;
public class Main
{
public static void main(String args[])
{
Scanner sc=new Scanner(System.in);
int A=sc.nextInt();
int B=sc.nextInt();
int C=sc.nextInt();
int D=sc.nextInt();
System.out.println("DIFERENCA"+" "+"="+" "+(A*B - C*D));
}
}