[a, b, c, d] = list(map(int, input().split()))
if d >= 10:
    print("Impossible")
combo = 1
score = 0
while b >= 100:
    score += 50 * combo
    combo += 1
    b -= 100
score += b * combo

while a >= 100:
    score += 100 * combo
    combo += 1
    a -= 100
score += a * combo
print("Possible\n{}".format(a))