#include <iostream>
#include <vector>
#include <algorithm>
#include <numeric>
int main()
{
std::vector<int> vec(15);
for (auto & elem : vec)
std::cin >> elem;
std::vector<int> evenVec;
bool even = true;
std::copy_if(std::begin(vec), std::end(vec), std::back_inserter(evenVec),
[&even](int elem) { return (even = !even) && (elem % 2 == 0); });
const int product = std::accumulate(std::begin(evenVec), std::end(evenVec), 1, std::multiplies<int>());
std::cout << (product == 1 ? 0 : product);
}
