#include<stdio.h>
#include<math.h>
int min(int a,int b,int c)
{
	int min,t;
	min=a;
	if(min>b)min=b;
	if(min>c)min=c;
	return min;
}
int main()
{
	int v,i,j,n,m,k,a,b,c,d,e;
	while(scanf("%d%d%d%d%d",&a,&b,&c,&d,&e)!=EOF)
	{
		min(a,b,c);
		if(d<e)
		{v=a*b*c-2*d*(a-2*e)*(c-2*e)-2*d*(a-2*e)*(b-2*e)-2*d*(b-2*e)*(c-2*e);}
		else
	    {if((a+b+c-6*e)*4*e*e+e*e*e*8>(a-2*d)*(b-2*d)*(c-2*d))
			   v=(a+b+c-6*e)*4*e*e+e*e*e*8;
		   else v=(a-2*d)*(b-2*d)*(c-2*d);
		}
		printf("%d\n",v);
	}
}