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

if d >= 10:
    print('Impossible')
    
else:
    print('Possible')
    sm = 0
    combo = 0
    for i in range(b):
        sm += 50*(2**(combo//100))
        combo += 1
    for i in range(a):
        sm += 100*(2**(combo//100))
        combo += 1
    print(sm)