stdin = input()
perfect,great,good,miss = stdin.split(" ")
cnt = 0
score = 0
dic = {1:100,2:200,4:300,8:400,16:500,32:600,64:700,128:800}
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
            for rate,line in dic.items():
                if cnt <= line and cnt > line-100:
                    score += rate * point
    print("Possible")
    print(score)