Jason is planning to buy a lollipop which costs ~Y~ dollars. He has 3 identical coins worth ~X~ dollars each, and the shop doesn't give any change.

Can Jason purchase the lollipop without spending any extra money?

Input Specifications

The first line contains ~X~ and the second line contains ~Y (0 \le X, Y \le 100)~.

Output Specifications

Output yes if Jason can purchase the lollipop without spending any extra money or no otherwise.

Sample Input

3
6

Sample Output

yes