a, b, _, d = map(int, input().split())

if d >= 10:
	print("Impossible")

else:
    print("Possible")
    
    score = 0
    cnt = 0

    for _ in range(b):
        cnt += 1
        score += 50 * (2**((cnt-1)//100))
    
    for _ in range(a):
        cnt += 1
        score += 100 * (2**((cnt-1)//100))
    
    print(score)