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

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