a,b,c,d = map(int,input().split())
if d == 10:
  print("Impossible")
  exit()
cou = 0
co = 1
ans = 0
for i in range(b):
  ans += 50 * co
  cou += 1
  if cou % 100 == 0:
    co *= 2
for i in range(a):
  ans += 100*co
  cou += 1
  if cou % 100 == 0:
    co *= 2
print("Possible")
print(ans)