#!/usr/bin/env python3
from collections import defaultdict


def memoize(f):
    table = {}

    def func(*args):
        if not args in table:
            table[args] = f(*args)
        return table[args]
    return func


@memoize
def nexts(node):
    r = sum([int(x) for x in list(format(node[0], "b"))])
    nxts = [i + node[0] for i in [-r, r] if 0 < i + node[0] <= N]
    return zip(nxts, [node[1] + 1] * len(nxts))


N = int(input())
node = (1, 1, 0)
pend = []
pended = []
route = {}
while node[0] < N:
    nxts = [n for n in nexts(node) if n[0] not in pended]
    pend.extend(nxts)
    pended.extend([n[0] for n in nxts])
    if len(pend) == 0:
        print(-1)
        exit()
    node = pend.pop(0)

print(node[1])