A, B, C, D = map(int, input().split())
point = 0
i = 0
if D >= 10:
	print('Impossible')
else:
	print('Possible')
	while B > 0:
		point += 50*2**(i//100)
		B = B - 1
		i += 1
	
	while A > 0:
		point += 100*2**(i//100)
		A = A - 1
		i += 1
	
	print(point)