A, B, C, D = map(int, input().split())
if D >= 10:
    print("Impossible")
    exit()
print("Possible")
score = 0
for i in range(8):
    if B > 0:
        score += 50*(2**i)*min(100, B)
    B -= 100
    if B <= 0:
        score += 100*(2**i)*max(min(-B, A), 0)
        A += B
        B = 0

print(score)