def main():
    N = int(input())
    route = list(range(1, N + 1))
    current = 0
    moved = 1
    over = 0
    while route[current] != N:
        step = get_step(route[current])
        if current + step < len(route):
            current += step
        else:
            current -= step
            over += 1
            if over > 1:
                moved = -1
                break
        moved += 1
    print(moved)
    
def get_step(value):
    step = 0
    while value > 0:
        if (value & 1) == 1:
            step += 1
        value >>= 1
    return step

if __name__ == '__main__':
    main()