PERFECT = 0
GREAT = 1
GOOD = 2
MISS = 3
SCORE_TABLE = [100, 50, 0, 0]
INITIAL_LIFE = 1000
MISS_LIFE_LOSS = 100
COMBO_TH = 100


def solve(num_perfect, num_great, num_good, num_miss):
    life = INITIAL_LIFE
    score = 0
    # miss
    life -= MISS_LIFE_LOSS * num_miss
    if life <= 0:
        return None
    # combo
    for i in range(num_great + num_perfect):
        if i < num_great:
            added_score = SCORE_TABLE[GREAT]
        else:
            added_score = SCORE_TABLE[PERFECT]
        x = 2 ** (i // COMBO_TH)
        score += x * added_score
    return score


def main():
    a, b, c, d = (int(z) for z in input().split())
    res = solve(a, b, c, d)
    if res is None:
        print("Impossible")
    else:
        print("Possible")
        print(res)

if __name__ == '__main__':
    main()