with Ada.Text_IO;
with Ada.Integer_Text_IO;
with Ada.Float_Text_IO;
use Ada.Text_IO;
use Ada.Integer_Text_IO;
use Ada.Float_Text_IO;

procedure hoge is
 k: integer;
 x: integer;
begin
 get(k);
 get(x);
 if 500*k>=x then
  put_line("Yes");
 else
  put_line("No");
 end if;
end hoge;