lsC = [int(input()) for i in range(26)]


need = [(3,1),(4,1),(7,1),(11,3),(14,2),(17,1),(22,1)]
ls = [3,4,7,17,22]
ans = 1
for i in ls:
    ans *= lsC[i]
ans *= (lsC[14]//2)*(-(-lsC[14]//2))
if lsC[11] <3:
    print(0)
    exit()
maxl = 0
for i in range(2,lsC[11]):
    v = (i*(i-1))//2 * (lsC[11]-i)
    maxl = max(maxl,v)

ans *= maxl
print(ans)