*a, = map(int,open(0).read().split())
ans = a[7]*a[4]*a[22]*a[17]*a[3]
L,O = a[11],a[14]
r = 0
for i in range(L):
    r = max(r,i*(L-i)*(L-i-1)//2)
ans *= r
r = 0
for i in range(O):
    r = max(r,i*(O-i))
print(ans*r)