"use strict"
function Main(input) {
  input = input.trim().split(' ').map(Number);
  const K = input[0];
  const X = input[1];

  if(K * 500 >= X) {
    console.log('Yes')
    return;
  }
  console.log('No');
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));