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