a, b, c, d = map(int, input().split())
if d >= 10:
    print("Impossible")
else:
    print("Possible")
    ans = 0
    qb, rb = divmod(b, 100)
    for i in range(qb + 1):
        if i == qb:
            ans += rb * 50 * 2**i
        else:
            ans += 100 * 50 * 2**i
    qa, ra = divmod(a + b, 100)
    for i in range(qb, qa + 1):
        if i == qa:
            ans += ra * 100 * 2**i
        elif i == qb:
            ans += (100 - rb) * 100 * 2**i
        else:
            ans += 100 * 100 * 2**i
    print(ans)