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