A, B, C, D = list(map(int, input().split()))
if D >= 10:
    print('Impossible')
else:
    print('Possible')
    score = 0
    for i in range(1, A + B + 1):
        if i <= B:
            score += 50*2^((i-1)//100)
        else:
            score += 100*2^((i-1)//100)
    print(score)