stdin = input()
perfect,great,good,miss = stdin.split(" ")
cnt = 0
score = 0
dic = {1:100,4:200,8:300,16:400,32:500,64:600,128:700,256:800}
if int(miss) >= 10:
    print("Impossible")

else:
    for i in range(1,int(great) + 1):
        cnt += 1
        if cnt <=100:
            score += 1 * 50
        elif cnt <= 200:
            score += 2 * 50
        elif cnt <= 300:
            score += 4 * 50
        elif cnt <= 400:
            score += 8 * 50
        elif cnt <= 500:
            score += 16 * 50
        elif cnt <= 600:
            score += 32 * 50
        elif cnt <= 700:
            score += 64 * 50
        elif cnt <= 800:
            score += 128 * 50
            
    for j in range(1,int(perfect) + 1):
        cnt += 1
        if cnt <=100:
            score += 1 * 100
        elif cnt <= 200:
            score += 2 * 100
        elif cnt <= 300:
            score += 4 * 100
        elif cnt <= 400:
            score += 8 * 100
        elif cnt <= 500:
            score += 16 * 100
        elif cnt <= 600:
            score += 32 * 100
        elif cnt <= 700:
            score += 64 * 100
        elif cnt <= 800:
            score += 128 * 100

    print("Possible")
    print(score)