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

s = 0
c = 0

for _ in range(B):
    s += 50 * 2**(c//100)
    c += 1

for _ in range(A):
    s += 100 * 2**(c//100)
    c += 1

print(['Impossible', '\n'.join(['Possible', str(s)])][D < 10])