A,B,C,D = map(int,input().split())
if D >= 10:
    print("Impossible")
else:
    score = 0
    chain = 1
    while B >= 100:
        score+=50 * 100 * chain
        chain*=2
        B-=100
    score+=50 * B * chain
    combo = 100 - B
    if A < combo:
        score+=100 * A * chain
    else:
        score+=100 * combo * chain
        A-=combo
        chain*=2
        while A >= 100:
            score+=100 * 100 * chain
            chain*=2
            A-=100
        score+=100 * A * chain
    print("Possible")
    print(score)