function main(input) {
  inputs = input.split(' ')
  num_of_coin = inputs[0]
  upper = inputs[1]
  
  if (500 * num_of_coin >= upper) {
    console.log('Yes')
  } else {
    console.log('No')
  }
}

main(require('fs').readFileSync('/dev/stdin', 'UTF-8'));
