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