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

if D >= 10:
    print("Impossible")
else:
    ans = 0
    t = -1
    while 1:
        if B >= 100:
            B -= 100
            t += 1
            ans += 100 * 50 * (2**t)
        else:
            t += 1
            ans += B * 50 *(2**t)
            break
    ans += min(100 - B,A) * 100 * (2**t)
    A -= min(100 - B,A)
    while 1:
        if A >= 100:  
            A -= 100
            t += 1
            ans += 100 * 100 * (2**t)
        else:
            t += 1
            ans += A * 100 *(2**t)
            break
    print("Possible")
    print(ans)