N = int(input())

jmp_to = {x: [x-d, x+d] for x,d in [[x, bin(x).count("1")] for x in range(1,N)]}

pos = {1}
passed = set()
cnt = 1
while len(pos) > 0:
    if N in pos:
        break
    passed.update(pos)
    new_pos = set()
    for i in pos:
        if i > 0 and i < N:
            new_pos.update(jmp_to[i])
    new_pos = new_pos - passed
    pos = new_pos
    cnt += 1
else:
    cnt = -1

print(cnt)