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