'use strict';
function Main(inputs) {
 
 const input = inputs.split("\n");
 
 const k = Number(input[0].split(' ')[0]);
 const x = Number(input[0].split(' ')[1]);

 console.log(k*500 >= x ? "Yes" : "No");
}
 Main(require("fs").readFileSync("/dev/stdin", "utf8"));