if __name__ == "__main__":

    score_list = [int(x) for x in input().split(" ")]
    perfect_num = score_list[0]
    great_num = score_list[1]
    good_num = score_list[2]
    miss_num = score_list[3]

    if miss_num >= 10:
        print("Impossible")

    else:
        combo_num = 0
        score = 0

        for i in range(great_num):
            buf = pow(2, combo_num // 100)
            score += 50 * buf
            combo_num += 1

        for i in range(perfect_num):
            buf = pow(2, combo_num // 100)
            score += 100 * buf
            combo_num += 1

        print("Possible")
        print(score)