A,B,C,D=map(int,input().split())
if D>=10:
    print("Impossible")
else:
    combo=0
    score=0
    for i in range(B):
        score+=(50*2**(combo//100))
        combo+=1
    for k in range(A):
        score+=(100*2**(combo//100))
        combo+=1
    print("Possible")
    print(score)