# -*- coding: utf-8 -*-
from sys import stdin

a,b,c,d = [int(x) for x in stdin.readline().rstrip().split()]
score = 0
combo = 0

if d == 10:
    print("Impossible")
    exit()
else:
    print("Possible")

for i in range(b):
    score += 50 * (2**(combo//100))
    combo += 1
for i in range(a):
    score += 100 * (2**(combo//100))
    combo += 1
print(score)