AT_abc447_a [ABC447A] Seats 2

There are $ N $ seats arranged in a row. Each seat can accommodate at most one person. Determine whether it is possible to seat $ M $ people in the seats satisfying the following condition. > No two adjacent seats may both be occupied.

The input is given from Standard Input in the following format: > $ N $ $ M $

Output `Yes` if it is possible to seat the people satisfying the condition, and `No` otherwise.

### Sample Explanation 1 For example, seating people in the first, third, and sixth seats from the left is one valid way. Thus, output `Yes`. ### Sample Explanation 2 There is no valid way to seat the people satisfying the condition. Thus, output `No`. ### Constraints - $ 1 \le N, M \le 100 $ - All input values are integers.