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;
using System.Collections;

public class MainApp
{
    static public void Main(string[] args)
    {
        int[] group1 = { 1, 3, 5, 7, 8, 10, 12 };
        int[] group2 = { 4, 6, 9, 11 };
        int group3 = 2;
        var read = Console.ReadLine();
        var split = read.Split(' ');
        int x = int.Parse(split[0]);
        int y = int.Parse(split[1]);
        int xgroup = 0;
        string output = "No";
        for (int c = 0; c < 7; c++)
        {
            if (x == group1[c])
                xgroup = 1;
        }
        for (int c = 0; c < 4; c++)
        {
            if (x == group2[c])
                xgroup = 2;
        }
        if (x == group3) xgroup = 3;
        if (xgroup == 1)
        {
            for (int c = 0; c < 7; c++)
            {
                if (y == group1[c])
                {
                    output = "Yes";

                }

            }

        }
        else if (xgroup == 2)
        {
            for (int c = 0; c < 4; c++)
            {
                if (y == group1[c])
                {
                    output = "Yes";
                }
            }

        }
        else if (xgroup == 3)
            if (y == group3)
                output = "Yes";
        Console.WriteLine(output);
    }
}