N = int(input())
moves = [bin(x).count('1') for x in range(N+1)]
routes = []
def move(now, route):
    route.add(now)
    if now == N:
        routes.append(len(route))
        print(route)
    else:
        back, go =  -1 * moves[now] + now, moves[now] + now
        for target in [back, go]:
            if (1 < target <= N) and (target not in route):
                move(target, route.copy())

move(1, set())
if len(routes) == 0:
    print(-1)  # unreachable
else:
    print(max(routes))