#include <iostream>

using namespace std;

unsigned long long MinAux(unsigned long long A, unsigned long long B){
    if(A>=B) return B;
    return A;
}

unsigned long long Min(unsigned long long A, unsigned long long B, unsigned long long C){
    return MinAux(A,MinAux(B,C));
}

int main()
{
    unsigned long long result;
    int A, B, C;
    cin >> A >> B >> C;

    if((A%2==0)||(B%2==0)||(C%2==0)) result = 0;
    else {
        result = Min(B*C, A*B, A*C);
    }
    cout << result << endl;

    return 0;
}