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

inputFormat

Input

Input is given from Standard Input in the following format:

K X

outputFormat

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

样例

1 501

No