A, B, C, D = map(int, input().split())

if D == 10:
    print("Impossible")
else:
    combo = C
    score = 0
    for i in range(0, B):
        score += 50 * (2 ** (i // 100))
    for i in range(B, A+B):
        score += 100 * (2 ** (i // 100))
    print("Possible")
    print(score)