Problem Statement

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.

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.

Constraints

• $1 \leq K \leq 100$
• $1 \leq X \leq 10^5$

Sample Input 1

2 900

Sample Output 1

Yes

Two 500-yen coins add up to 1000 yen, which is not less than X = 900 yen.

Sample Input 2

1 501

Sample Output 2

No

One 500-yen coin is worth 500 yen, which is less than X = 501 yen.

Sample Input 3

4 2000

Sample Output 3

Yes

Four 500-yen coins add up to 2000 yen, which is not less than X = 2000 yen.

见题面 Input 部分

见题面 Output 部分