import sys
a,b,c,d = map(int,input().split())
if d >= 10:
    print('Impossible')
    sys.exit()
ans,f,c=0,1,0
while b > 0:
    if b >= 100:
        ans+=50*f*100
        b-=100
        f*=2
    else:
        ans+=50*f*b
        c=b
        b=0
while a > 0:
    if c > 0:
        if a >= 100-c:
            ans+=100*f*(100-c)
            f*=2
            a-=(100-c)
            c=0
        else:
            ans+=100*f*a
            break
    elif a >= 100:
        ans+=100*f*100
        a-=100
        f*=2
    else:
        ans+=100*f*a
        a=0
print('Possible')
print(ans)