Problem:
Score : 100 points

Problem Statement

Based on some criterion, Snuke divided the integers from 1 through 12 into three groups as shown in the figure below.
Given two integers x and y (1 ≤ x < y ≤ 12), determine whether they belong to the same group.

Constraints

x and y are integers.

1 ≤ x < y ≤ 12

Input

Input is given from Standard Input in the following format:

x y

Output

If x and y belong to the same group, print Yes; otherwise, print No.

Sample Input 1

1 3

Sample Output 1

Yes

Sample Input 2

2 4

Sample Output 2

No

Solution in C# (Mono 4.6.2.0) (judge verdict: Wrong Answer)

using System;

class Program
{
  static void Main(string[] args)
  {
    string[] input = Console.ReadLine().Split(' ');
    int x = int.Parse(input[0]);
    int y = int.Parse(input[1]);
    
    if(x == 4 || x == 6 || x == 9 || x == 11) x = 1;
    else if(x == 2) x = 2;
    else x = 3;
    
    if(y == 4 || y == 6 || y == 9 || y == 11) y = 1;
    else if(y == 2) y = 2;
    else y = 3;
    
    if(x == y) Console.WriteLine("YES");
    else Console.WriteLine("No");
  }
}