import math
import sys
def S(): return sys.stdin.readline().rstrip()
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int, sys.stdin.readline().rstrip().split())
def LI(): return list(map(int, sys.stdin.readline().rstrip().split()))
def LS(): return list(sys.stdin.readline().rstrip().split())

a, b, c, d = MI()
if d == 10:
    print("Impossible")
    exit()
ans = 0
for i in range(a+b):
    c = 2**(i//100)
    if i < b:
        ans += 50*c
    else:
        ans += 100*c
print("Possible")
print(ans)