N = int(input())

bit_list = [len(bin(i).replace('0b', '').replace('0', '')) for i in range(0, N)]
bit_list.append('x')

idx = 1
count = 0

while True:
    count += 1

    if bit_list[idx] == 'x':
        print(count)
        break
    elif idx + bit_list[idx] > N:
        idx -= bit_list[idx]
    elif bit_list[idx] == 0:
        print(-1)
        break
    else:
        tmp = idx
        idx += bit_list[idx]
        bit_list[tmp] = 0