function main(arg){
	arg = arg.trim().split(' ');
 console.log(arg)
  	var money = arg[0] * 500;
  console.log(money)
	var out = money >= arg[1] ? 'Yes' : 'No';
  	console.log(out)
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));