import sys



k, x = list(map(int, sys.stdin.readline().split()))



def main():

    return 'Yes' if 500 * k >= x else 'No'



if __name__ == '__main__':

    ans = main()

    print(ans)
import sys



k, x = list(map(int, sys.stdin.readline().split()))



def main():

    ans = 'Yes' if 500*k >= x else 'No'

    print(ans)



if __name__ ==  '__main__':

    main()
import sys

k, x = list(map(int, sys.stdin.readline().split()))


def main():
    return "Yes" if 500 * k >= x else "No"


if __name__ == "__main__":
    ans = main()
    print(ans)

import sys

k, x = list(map(int, sys.stdin.readline().split()))


def main():
    ans = "Yes" if 500 * k >= x else "No"
    print(ans)


if __name__ == "__main__":
    main()

-    return "Yes" if 500 * k >= x else "No" +    ans = "Yes" if 500 * k >= x else "No" +    print(ans) -    ans = main() -    print(ans) +    main()