"use strict";
const Main = (input) =>{
   let xs = input.trim().split(' ').map(v=>parseInt(v,10));
   let X = xs[0] * 500;
   if(X >= xs[1]){
     console.log('Yes');
   }else{
     console.log('No');
   }

}
Main(require('fs').readFileSync('/dev/stdin','utf8'));