Problem:
Score : 200 points

Problem Statement

There are some animals in a garden. Each of them is a crane with two legs or a turtle with four legs.

Takahashi says: "there are X animals in total in the garden, and they have Y legs in total." Determine whether there is a combination of numbers of cranes and turtles in which this statement is correct.

Constraints

1 \leq X \leq 100

1 \leq Y \leq 100

All values in input are integers.

Input

Input is given from Standard Input in the following format:

X Y

Output

If there is a combination of numbers of cranes and turtles in which the statement is correct, print Yes; otherwise, print No.

Sample Input 1

3 8

Sample Output 1

Yes

The statement "there are 3 animals in total in the garden, and they have 8 legs in total" is correct if there are two cranes and one turtle. Thus, there is a combination of numbers of cranes and turtles in which the statement is correct.

Sample Input 2

2 100

Sample Output 2

No

There is no combination of numbers of cranes and turtles in which this statement is correct.

Sample Input 3

1 2

Sample Output 3

Yes

We also consider the case in which there are only cranes or only turtles.

Solution in Java (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		try{
			Scanner sc = new Scanner(System.in);
			
			int total = sc.nextInt();
			int reg = sc.nextInt();
			
			
			double ykamo = (reg-total)/6;
			if(ykamo*100 % 100 != 0){
				System.out.println("No");
			}else{
				int y = (reg-total)/6;
				int x = total-y;
				
				if(0 <= y && 0 <= x ){
					System.out.println("Yes");
				}else{
					System.out.println("No");
				}
			}
		}catch(Exception e){
			System.out.println("No");
		}
	}
}