c=[int(input()) for _ in range(26)]
a=c[3]*c[4]*c[7]*(c[14]//2)*(c[14]-c[14]//2)*c[17]*c[22]
b=0
for i in range(c[11]+1):
    b=max(b,i*(i-1)//2*(c[11]-i))
print(a*b)