a, b, c, d = map(int, input().split())
if d == 10:
    print("Impossible")
    exit()
    
score = 0
cnt = 0
times = 1
for _ in range(b):
    score += 50 * times
    cnt += 1
    if cnt == 100:
        cnt = 0
        times *= 2
        
for _ in range(a):
    score += 100 * times
    cnt += 1
    if cnt == 100:
        cnt = 0
        times *= 2
print("Possible")
print(score)