open System
let R T = stdin.ReadLine()|> T
let RS T = stdin.ReadLine().Split()|>Array.map T
let Mod = (1e9|>int64)+7L
[<EntryPoint>]
let main argv =
    RS int|>(fun c -> if c.[0]*500>=c.[1] then "Yes" else "No")|>stdout.WriteLine
    0
