std_in = input()
perfect,great,good,miss = std_in.split(" ")
cnt = 0
score = 0

if int(miss) >= 10:
    print("Impossible")

else:
    for cate,point in {great:50,perfect:100}.items():
        for i in range(1,int(cate) + 1):
            cnt += 1
            if cnt <=100:
                score += 1 * point
            elif cnt <= 200:
                score += 2 * point
            elif cnt <= 300:
                score += 4 * point
            elif cnt <= 400:
                score += 8 * point
            elif cnt <= 500:
                score += 16 * point
            elif cnt <= 600:
                score += 32 * point
            elif cnt <= 700:
                score += 64 * point
            elif cnt <= 800:
                score += 128 * point            
    print("Possible")
    print(score)