def calc():
    A,B,C,D =map(int,input().split())
    if D >= 10:
        print("Impossible")
        return
    score = 0
    for num,sco in zip([A+B,B],[100,-50]):
        plus = sco
        for i in range(8):
            if num -100*i < 101:
                score += (num -100*i)*plus
                break
            else:
                score += 100*plus
            plus *= 2
    print("Possible")
    print(score)
calc()