open System

let bitCount x =
    let mutable x = x
    x <- x - ((x >>> 1) &&& 0x55555555)
    x <- (x &&& 0x33333333) + ((x >>> 2) &&& 0x33333333)
    x <- (x + (x >>> 4)) &&& 0x0f0f0f0f;
    x <- x + (x >>> 8);
    x <- x + (x >>> 16);
    x &&& 0x3f

let isLeachable n =
    let dis = Array.zeroCreate (n + 1)
    dis.[1] <- 1
    let rec visit x =        
        let bit = bitCount x
        let f = x - bit
        let b = x + bit
        let f1 = f >= 1 && dis.[f] = 0
        let f2 = b <= n && dis.[b] = 0
        match (f1, f2) with
        | true, true -> 
            dis.[f] <- dis.[x] + 1
            dis.[b] <- dis.[x] + 1
            visit f
            visit b
        | true, false ->
            dis.[f] <- dis.[x] + 1
            visit f
        | false, true ->
            dis.[b] <- dis.[x] + 1
            visit b
        | false, false ->
            ()
    visit 1
    dis.[n]
        
let N = Console.ReadLine() |> int

isLeachable N
|> function
| 0 -> -1
| x -> x
|> Console.WriteLine