a,b,c,d=map(int,input().split())

if d>=10:
    exit(print("Impossible"))
    
    
ans=0
com=0
for i in range(b):
    ans+=50*2**(com//100)
    com+=1

for i in range(c):
    ans+=100*2*(com//100)
    com+=1

print("Possible")
print(ans)