a,b,c,d=map(int,input().split())
if d==10:
    print('Impossible')
else:
    print('Possible')
    k=[50]*b+[100]*a
    ans=0
    bairitu=1
    for i in range(a+b):
        ans+=k[i]*bairitu
        if i%100==99:
            bairitu*=2
    print(ans)