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

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
            
    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

    print("Possible")
    print(score)