#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;
		return 0;
	}
	cout<<min(min(a*b,b*c),a*c)<<endl;
	return 0;
}