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 C# (Mono-mcs 6.8.0.105) (judge verdict: Wrong Answer)

using System;

namespace ABC170B
{
    class Program
    {
        static void Main(string[] args)
        {
            var str = Console.ReadLine().Split(' ');
            var x = int.Parse(str[0]);
            var y = int.Parse(str[1]);

            if (y % 2 != 0)
            {
                Console.WriteLine("No");
            }

            var flag = false;
            for (var i = 0; i <= x; i++)
            {
                var tsuru = i * 4;
                var kame = (x - i) * 2;

                if (y == tsuru + kame)
                {
                    flag = true;
                    Console.WriteLine("Yes");
                }
            }

            if (!flag)
            {
                Console.WriteLine("No");
            }
        }
    }
}