a,b,c,d = map(int,input().split())
if d >= 10:
    print("Impossible")
    exit()
print("Possible")
ans = 0
combo = 0
r = 1
pt = [50]*b+[100]*a
for i in range(1,b+a+1):
    ans += r*pt[i-1]
    if i%100==0:
        r *= 2
print(ans)