A,B,C,D=[int(e) for e in input().split()]
if D>=10:
	print("Impossible")
else:
	print("Possible")
	c=0; s=0
	for i in range(B):
		s+=50*(2**(c//100))
		c+=1
	for i in range(A):
		s+=100*(2**(c//100))
		c+=1
	print(s)