#include <iostream>
#include <stack>
#include <string>
#include <map>
#include <set>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <deque>
#include <cstdio>
#include <unordered_map>

//wanna sleeep...

using namespace std;

int main () {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    vector<int> numbers;
    int a;
    for (int i = 0; i < 8; ++i) {
        cin >> a;
        numbers.push_back(a);
    }
    int ans = 1;
    cin >> a;
    numbers.push_back(a);
    ans = numbers[0] * a;
    while (a > 0) {
        cin >> a;
        if (a <= 0) break;
        if (numbers[1] > numbers[0]) {
            numbers.erase(numbers.begin());
        }
        else  {
            numbers.erase(numbers.begin() + 1);
        }
        numbers.push_back(a);
        if (a * numbers[0] > ans)
            ans = a * numbers[0];
    }
    cout << ans;
    return 0;
}