def main():
    a, b, c, d = map(int, input().split())

    if d >= 10:
        print("Impossible")
        exit()

    print("Possible")
    ans = 0
    combo = 0
    for _ in range(b):
        ans += 50 * 2 ** (combo // 100)
        combo += 1
    for _ in range(a):
        ans += 100 * 2 ** (combo // 100)
        combo += 1
    print(ans)


if __name__ == "__main__":
    main()