Contest Duration: - (local time) (100 minutes) Back to Home
A - 2UP3DOWN /

Time Limit: 2 sec / Memory Limit: 1024 MB

制約

• 1 \leq X,Y \leq 100
• X \neq Y
• 入力は全ては整数である

入力

X Y


入力例 1

1 4


出力例 1

No


1 階から 4 階への移動は 3 階分の上りなのでエレベーターを使います。

入力例 2

99 96


出力例 2

Yes


99 階から 96 階への移動は 3 階分の下りなので階段を使います。

入力例 3

100 1


出力例 3

No


Score : 100 points

Problem Statement

Takahashi is in a building with 100 floors.

He uses the stairs for moving up two floors or less or moving down three floors or less, and uses the elevator otherwise.

Does he use the stairs to move from floor X to floor Y?

Constraints

• 1 \leq X,Y \leq 100
• X \neq Y
• All input values are integers.

Input

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

X Y


Output

If Takahashi uses the stairs for the move, print Yes; if he uses the elevator, print No.

Sample Input 1

1 4


Sample Output 1

No


The move from floor 1 to floor 4 involves going up three floors, so Takahashi uses the elevator.

Sample Input 2

99 96


Sample Output 2

Yes


The move from floor 99 to floor 96 involves going down three floors, so Takahashi uses the stairs.

Sample Input 3

100 1


Sample Output 3

No