a,b,c,d=map(int,input().split())
if d>=10:
    print('Impossible')
else:
    ans=0
    i=-1
    while b>0:
        i+=1
        ans+=min(b,100)*50*2**i
        b-=100
        if b<100:
            i+=1
            ans+=b*50*2**i+min(100-b,a)*100*2**i
            a-=100-b
            b=0
    while a>0:
        i+=1
        ans+=min(a,100)*100*2**i
        a-=100
    print('Possible\n{}'.format(ans))