c=[int(input()) for i in range(26)]
d=max(c[3],0)
e=max(c[4],0)
h=max(c[7],0)
l=0
if c[11]>=3:
  for i in range(2,c[11]):
    l=max(l,i*(i-1)//2*(c[11]-i))
o=0
if c[14]>=2:
  for i in range(1,c[14]):
    o=max(o,i*(c[14]-i))
r=max(c[17],0)
w=max(c[22],0)
print(d*e*h*l*o*r*w)