perfect, great, good, miss = map(int, input().split())
if miss == 10:
    print('Impossible')
else:
    print('Possible')
    combo, score = 0, 0
    for _ in range(great):
        score += 50 * 2 ** (combo // 100)
        combo += 1
    for _ in range(perfect):
        score += 100 * 2 ** (combo // 100)
        combo += 1
    print(score)