a, b, c, d = map(int, input().split())
if d >= 10:
    print("Impossible")
else:
    print("Possible")
    ans = 0
    for i in range(b):
        ans += 2 ** (i // 100) * 50
    for i in range(b, a + b):
        ans += 2 ** (i // 100) * 100
    print(ans)