Problem:
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.

Solution in Python (3.4.3) (judge verdict: Runtime Error)

from itertools import permutations

n = int(input())
p = tuple(map(int, input().split()))
q = tuple(map(int, input().split()))

p_index = 0
q_index = 0
for i, perm in enumerate(permutations(range(1, n+1))):
    if perm == p:
        p_index = i
    if perm == q:
        q_index = i
print(abs(p_index - q_index))