#include <bits/stdc++.h>
using namespace std;

int main()
{
	long long a[3];
	scanf("%lld %lld %lld",&a[0],&a[1],&a[2]);
	if((a[0]%2==0)||(a[0]%2==0)||(a[0]%2==0))
	{
		cout<<0<<"\n";
		return 0;
	}
	sort(a,a+3);
	long long sum1=a[0]*a[1];
	printf("%lld\n",sum1);
}