def step(num):
    return sum(list(map(int, list(format(num, 'b')))))

step.res_dict = {}

N = int(input())
m = 1
cnt = 0
while True:
    next = step(m)
    cnt += 1
    if N < m + next:
        m -= next
    elif N > m + next:
        m += next
    else:
        m += next
        cnt += 1
        print(cnt)
        break
    if cnt > N*N:
        print(-1)
        break