Problem Statement

There is an infinitely long piano keyboard.
Is there a continuous segment within this keyboard that consists of W white keys and B black keys?

Let S be the string formed by infinitely repeating the string wbwbwwbwbwbw.
Is there a substring of S that consists of W occurrences of w and B occurrences of b?

What is a substring of S?
A substring of S is a string that can be formed by concatenating the $l-th, (l+1)-th, \dots, r-th$ characters of S in this order for some two positive integers l and $r (l\leq r)$.

Input

The input is given from Standard Input in the following format:
W B

Output

If there is a substring of S that consists of W occurrences of w and B occurrences of b, print Yes; otherwise, print No.

Constraints

• W and B are integers.
• $0\leq W,B \leq 100$
• $W+B \geq 1$

Sample Input 1

3 2

Sample Output 1

Yes

The first 15 characters of S are wbwbwwbwbwbwwbw. You can take the 11-th through 15-th characters to form the string bwwbw, which is a substring consisting of three occurrences of w and two occurrences of b.

Sample Input 2

3 0

Sample Output 2

No

The only string consisting of three occurrences of w and zero occurrences of b is www, which is not a substring of S.

Sample Input 3

92 66

Sample Output 3

Yes

见题面 Input 部分

见题面 Output 部分