a,b,c,d = map(int,input().split())
if d == 10:
	print("Impossible")
else:
	print("Possible")
	score = 0
	combo = 0
	for i in range(b):
		score += 50*(2**(combo//100))
		combo += 1
	for i in range(a):
		score += 100*(2**(combo//100))
		combo += 1
	print(score)