a, b, c, d = map(int, input().split())

if d >= 10:
    print("Impossible")

else:
    s = 0
    c = 0
    for i in range(b):
        s += 50 * (2**(c//100))
        c += 1
    for i in range(a):
        s += 100 * (2**(c//100))
        c += 1

    print("Possible")    
    print(s)