open System
type Sol() =
    member this.Solve() = 
        let a = stdin.ReadLine() |> int
        let b = stdin.ReadLine() |> int
        let c = stdin.ReadLine() |> int
        
        let t1 = a/b + if (a % b) <> 0 then 1 else 0
        let t2 = a/c + if (a % b) <> 0 then 1 else 0
        
        (if (3 * t2) > (t1 * 2) then "NO" else "YES") |> printfn "%s"
        
let mySol = new Sol()
mySol.Solve()