k,x = map(int,input().split())
y = 'Yes'
n = 'No'
if (500*k) < x:
  print(n)
elif (500*k) >= x:
  print(y)
5313d03b6244baf5e698a48754a47ce7a3b5b20e
<mask token>

<mask token>
if 500 * k < x:
    print(n)
elif 500 * k >= x:
    print(y)

k, x = map(int, input().split())
y = 'Yes'
n = 'No'
if 500 * k < x:
    print(n)
elif 500 * k >= x:
    print(y)

k,x = map(int,input().split())
y = 'Yes'
n = 'No'
if (500*k) < x:
  print(n)
elif (500*k) >= x:
  print(y)