a, b, c, d = map(int, input().split())

if d >= 10:
    print('Impossible')
else:
    sa = 0
    sb = 0
    sab = 0
    
    bc = b // 100
    if bc >= 1:
        for i in range(bc):
            sb += 50 * 2**i * 100
        sb += 50 * 2**(bc) * (b % 100)
    else:
        sb += 50 * b

    ab = b    
    abc = ab // 100
    if abc >= 1:
        for i in range(abc):
            sa += 100 * 2**i * 100
        sa += 100 * 2**(abc) * (ab % 100)
    else:
        sa += 100 * ab

    a += b    
    ac = a // 100
    if ac >= 1:
        for i in range(ac):
            sab += 100 * 2**i * 100
        sab += 100 * 2**(ac) * (a % 100)
    else:
        sab += 100 * a

    print('Possible')    
    print(sab - sa + sb)