a,b,c,d = map(int,input().split())
if d >= 10:
    print('Impossible')
else:
    ans = 0
    cnt = 0
    mul = 1
    for i in range(b):
        ans += 50 * mul
        cnt += 1
        mul = pow(2,cnt//100)
    for i in range(a):
        ans += 100 * mul
        cnt += 1
        mul = pow(2,cnt//100)
    print('Possible')
    print(ans)