function main(input) {
  var args = input.trim().split(" ");
  var k = parseInt(args[0], 10);
  var x = parseInt(args[1], 10);
  var k = 500 * k;
  if ( k >= x ) {
    return "Yes";
  } else {
    return "No";
  }
}
console.log(main(require('fs').readFileSync('/dev/stdin', 'utf8')));