"use strict";

function main(input) {
  input = input.trim().split(" ");
  const K = parseInt(input[0]);
  const X = parseInt(input[1]);
  const coin = 500;
  if (coin * K >= X) {
    console.log("Yes");
  } else {
    console.log("No");
  }
}

main(require("fs").readFileSync("/dev/stdin", "utf-8"));
