#include <cstdio>
#include <cstdlib>
#include <cstddef>
#include <vector>
#include <algorithm>
#include <cmath>
#include <string>
#include <iostream>
#include <iomanip>
#define L64 long long
#define MOD (1000000007LL)

int main(void)
{
  L64 l, o, h, e, w, r, d;
  for(int i = 1; i <= 26; i++){
    L64 a;
    std::cin >> a;
    if(i == 4) { d = a; }
    else if(i == 5) { e = a; }
    else if(i == 8) { h = a; }
    else if(i == 12) { l = a; }
    else if(i == 15) { o = a; }
    else if(i == 18) { r = a; }
    else if(i == 23) { w = a; }
  }
  if(d == 0 || e == 0 || h == 0 || l < 3LL || o < 2LL || r == 0 || w == 0){
    std::cout << 0 << std::endl;
  } else {
    L64 ret = d * e * h * r * w;
    L64 lmax = 1;
    for(L64 i = 0; i <= l - 3LL; i++){
      lmax = std::max(lmax, (i + 2LL) * (i + 1LL) / 2LL * (l - 2LL - i));
    }
    ret *= lmax;
    L64 omax = 1;
    for(L64 i = 0; i <= o - 2LL; i++){
      omax = std::max(omax, (i + 1LL) * (o - 1LL - i));
    }
    ret *= omax;
    std::cout << ret << std::endl;
  }
}