"use strict";
function main(input) {
  const kari = input[0].trim().split(" ").map(i => parseInt(i));
  const k = kari[0];
  const x = kari[1];
 
  if(k*500>=x){
    console.log("Yes");
  }else{
    console.log("No");
  }
 
}
main(require('fs').readFileSync('/dev/stdin', 'utf8').trim().split("\n"));