A, B, C, D = list(map(int, input().split()))
if D >= 10:
    print('Impossible\n')
else:
    print('Possible')
    score = 0
    for i in range(A + B):
        if i < B:
            score += 50*2^(i//100)
        else:
            score += 100*2^(i//100)
    print(score)