Contest Duration: - (local time) (100 minutes) Back to Home
A - 500 Yen Coins /

Time Limit: 2 sec / Memory Limit: 1024 MB

• 1 ≤ K ≤ 100
• 1 ≤ X ≤ 10^5

入力

K X


入力例 1

2 900


出力例 1

Yes


500 円玉が 2 枚なので総額は 1000 円であり、これは X = 900 円以上です。

入力例 2

1 501


出力例 2

No


500 円玉が 1 枚なので総額は 500 円であり、これは X = 501 円未満です。

入力例 3

4 2000


出力例 3

Yes


500 円玉が 4 枚なので総額は 2000 円であり、これは X = 2000 円以上です。

Score : 100 points

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.