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.

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.

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.