"use strict";
function main(input) {
  let k = 0;
  let x = 0;
  [k, x] = input[0].trim().split(" ").map(i => parseInt(i));

  if(k*500>=x){
    console.log("Yes");
  }else{
    console.log("No");
  }

}
main(require('fs').readFileSync('/dev/stdin', 'utf8').trim().split("\n"));