题解 | #(a+b-c)*d的计算问题#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
       int a = in.nextInt();
       int b = in.nextInt();
       
       int c = in.nextInt();
       int d = in.nextInt();

       System.out.printf("%d",((a+b-c)*d));
    }
}