import sys


def next_str() -> str:
    result = ""
    while True:
        tmp = sys.stdin.read(1)
        if tmp.strip() != "":
            result += tmp
        elif tmp != '\r':
            break
    return result


def next_int() -> int:
    return int(next_str())


def main() -> None:
    score = 0
    bonus = 1
    pf, gt, gd, ms = [next_int() for _ in range(4)]

    if ms >= 10:
        print("Impossible")
        return

    for i in range(1, sys.maxsize):
        if gt == 0 and pf == 0:
            break
        elif gt != 0:
            score += 50 * bonus
            gt -= 1
        elif pf != 0:
            score += 100 * bonus
            pf -= 1

        if i % 100 == 0:
            bonus *= 2

    print("Possible\n" + str(score))


if __name__ == '__main__':
    main()