import sys
input=lambda: sys.stdin.readline().rstrip()
A=[int(input()) for _ in range(26)]
ans=A[7]*A[4]*A[22]*A[17]*A[3]
l,o=A[11],A[14]
ans*=o//2*(o-o//2)
ll=0
for i in range(2,l):
  ll=max(ll,i*(i-1)//2*(l-i))
print(ll*ans)