import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

A,B,C,D = map(int,readline().split())

if D == 10:
    print('Impossible')
    exit()

score = [50]*B + [100]*A
answer = 0
for combo, x in enumerate(score):
    coef = 2 ** (combo//100)
    answer += coef * x

print('Possible')
print(answer)