A, B, C, D = map(int,input().split())
if D > 9: S = "Impossible"
else:
	S, T = 0, 0
	for i in [1] * B: S += 50 * 2 ** (T // 100); T += 1
	for j in [1] * A: S += 100 * 2 ** (T // 100); T += 1
	print("Possible")
print(S)