C = [int(input()) for _ in range(26)]

X = 0
Y = C[3]*C[4]*C[7]*(C[14]//2)*(C[14]-C[14]//2)*C[17]*C[22]

for i in range(C[11]+1):
    X = max(X, i*(i-1)//2*(C[11]-i))

print(X*Y)