#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(1LL*B*C, 1LL*A*B, 1LL*A*C);
    }
    cout << result << endl;
 
    return 0;
}
 

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