A,B,C,D=map(int,input().split())

if D==10:
    print("Impossible")
    exit()

K=0
S=0
for (X,T) in [(B,50),(A,100)]:
    for _ in [0]*X:
        S+=T*(2**(K//100))
        K+=1

print("Possible",S,sep="\n")