function Main(input) {
  var nums = input.split(' ');

  var mai = Math.floor(nums[0]);
  var kingaku = Math.floor(nums[1]);
  
  if (mai * 500 >= kingaku) {
    console.log('Yes');
  } else {
    console.log('No');
  }
  
}
Main(require('fs').readFileSync('/dev/stdin', 'utf8'));