'use strict'


function Main(input) {

  input = input.trim().split(' ').map(s => parseInt(s))
  const N = input[0]
  const MAX = input[1]

  const res = 500 * N

  console.log(input)
  if (res >= MAX) {
    console.log('Yes')
  } else {
    console.log('No')
  }
  
  
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));