a,b,c,d = map(int,input().split())
ans = 0
bonus = 1
ok = 0

if d >= 10:
    print("Impossible")
else:
    for i in range(b+1):
        if i > 0:
            ans += 50 * bonus
            ok += 1
            if ok % 100 == 0:
                bonus *= 2

    for i in range(a+1):
        if i > 0:
            ans += 100 * bonus
            ok += 1
            if ok % 100 == 0:
                bonus *= 2

    print("Possible")
    print(ans)