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