#include<iostream>
#include<algorithm>
using namespace std;
int main()
{
	long long a[3];
    cin>>a[0]>>a[1]>>a[2];
	sort(a,a+3);
	if(a[2]%2==0)
	 cout<<"0"<<endl;
	else
	 cout<<a[0]*a[1]<<endl;
	return 0; 
} 