life=1000
A,B,C,D,=map(int,input().split())
if D<10:#pass
    ans=0
    comb=0
    for i in range(C):
        ans+=0*(2**(comb//100))
    for i in range(B):
        ans+=50*(2**(comb//100))
        comb+=1
    for i in range(A):
        ans+=100*(2**(comb//100))
        comb+=1
    print("Possible")
    print(ans)
else:print("Impossible") #fail