#include<stdio.h>
int main(void){
	int a,b,c,d,e,v,v1,v2,v3;
	while(scanf("%d %d %d %d %d",&a,&b,&c,&d,&e)!=EOF)
	{
	v=a*b*c;
	v1=v-(a-2*e)*(b-2*e)*(c-2*e)-2*e*(a-2*e)*(b-2*e)-2*e*(a-2*e)*(c-2*e)-2*e*(b-2*e)*(c-2*e);
	v2=(a-2*d)*(b-2*d)*(c-2*d);
	v3=v-2*d*(a-2*e)*(b-2*e)-2*d*(a-2*e)*(c-2*e)-2*d*(b-2*e)*(c-2*e);
	if(d<e)
	{
	printf("%d\n",v3);
	}
	else
	{
	if(v1>v2)
	{
	printf("%d\n",v1);
	}
	else
	{
	printf("%d\n",v2);
    }
	}
	}
	return 0;
}