import numpy as np



K, X = [int(i) for i in input().split()]



if 500 * K >= X:

    print('Yes')

else:

    print('No')

K, X = [int(i) for i in input().split()]



if 500 * K >= X:

    print('Yes')

else:

    print('No')
import numpy as np

K, X = [int(i) for i in input().split()]
if 500 * K >= X:
    print("Yes")
else:
    print("No")

K, X = [int(i) for i in input().split()]
if 500 * K >= X:
    print("Yes")
else:
    print("No")

-import numpy as np -