def main():
    a=[int(input()) for _ in range(26)]
    a11=a[11]
    pl=max(n*(n-1)*(a11-n)//2 for n in range(1,a11))
    a14=a[14]
    po=(a14//2)*(a14-a14//2)
    ans=a[3]*a[4]*a[7]*a[17]*a[22]*pl*po
    print(ans)

main()