# -*- coding: utf-8 -*-
__author__ = 'yuuki'
#No.3 ビットすごろく

N = input()
bN = bin(N)
M = 1
c = 0
L = [0] * N

while(1):
    c += 1

    if M == N:
        print c
        break
    elif L[M-1] == 1:
        print "-1"
        break
    elif M + bin(M).count("1") > N:
        L[M-1] = 1
        M -= bin(M).count("1")
    else:
        M += bin(M).count("1")