import heapq
from heapq import heappop, heappush, heapify

N = int(input())
# N = 5

stack = []
heappush(stack, (1, 0, [True]+[False]*(N-1), "1")) # count, position, arrived, root
D = [1] + [float("inf")]*(N-1) # saitankyorimap

flag = False
while len(stack) != 0:
    count, position, arrived, root = heappop(stack)
    number = position + 1

    if number == N:
        print(count)
        flag = True
        break

    move_size = bin(number).count("1")
    for move in (move_size, - move_size):
        new_position = position + move
        new_count = count + 1
        new_arrived = dcopy(arrived)
        new_root = root + str(new_position + 1)
        if not (0 <= new_position <= N-1):
            pass
        elif new_arrived[new_position]:
            pass
        elif D[new_position] <= count:
            pass
        else:
            new_arrived[new_position] = True
            D[new_position] = count
            # print(new_root)
            heappush(stack, (new_count, new_position, new_arrived, new_root))

if not flag:
    print(-1)