a, b, c, d = map(int, input().split())
perfect = 100
great = 50
good = 0
miss = -100
combo = 0
ans = 0

if d >= 10:
  print('Impossible')
else:
  for i in range(b):
    ans += great
    combo += 1
    if combo >= 100 and combo % 100 == 0:
      perfect *= 2
      great *= 2
  
  for i in range(a):
    ans += perfect
    combo += 1
    if combo >= 100 and combo % 100 == 0:
      perfect *= 2
      great *= 2
  print('Possible')
  print(ans)