p02811 AtCoder Beginner Contest 150 - 500 Yen Coins
Takahashi has K 500-yen coins. (Yen is the currency of Japan.) If these coins add up to X yen or more, print `Yes`; otherwise, print `No`.

Constraints

* 1 \leq K \leq 100
* 1 \leq X \leq 10^5

Input

Input is given from Standard Input in the following format:


K X


Output

If the coins add up to X yen or more, print `Yes`; otherwise, print `No`.

Examples

Input

2 900


Output

Yes


Input

1 501


Output

No


Input

4 2000


Output

Yes
```python
k,x=map(int,input().split());print('YNeos'[500*k<x::2])
```