let solve (k: int64) darr =
    let len_darr = Array.length darr
    let chk_arr = Array.create len_darr false
    
    let rec get_len_loop start current result =
        chk_arr.[current] <- true

        let next = darr.[current]
        let result = current::result

        //eprintfn "get_len_loop: %A" (start, current, result)

        if next = start then (List.length result) - 1
        else
            get_len_loop start next result
    
    let rec get_len_loop_sum idx result =
        //eprintfn "get_len_loop_sum: %A" (idx, result)

        if idx >= len_darr then result
        else
            if chk_arr.[idx] then get_len_loop_sum (idx + 1) result
            else
                let len_loop = get_len_loop idx idx []
                get_len_loop_sum (idx + 1) (result + len_loop)

    let len_loop = get_len_loop_sum 0 0

    k >= (int64 len_loop) && (k - (int64 len_loop)) % 2L = 0L

let () =
    let _, k = stdin.ReadLine()
               |> fun s -> s.Split()
               |> Array.map int64
               |> fun arr -> (arr.[0], arr.[1])
    let darr = stdin.ReadLine()
               |> fun s -> s.Split()
               |> Array.map int
               |> Array.map (( + ) -1)
    
    solve k darr
    |> function | true -> "YES" | false -> "NO"
    |> printfn "%s"