#include <bits/stdc++.h>
using namespace std;
int main() {
  long long a[3];
  cin >> a[0] >> a[1] >> a[2];
  sort(a, a + 3);
  if ((a[0] % 2 == 0) || (a[1] % 2 == 0) || (a[2] % 2 == 0))
    cout << 0 << endl;
  else
    cout << a[0] * a[1];
}
