#include<stdio.h>
#include<string.h>
#include<math.h>
int a[1000][1000]={0};
int main(){

int a,b,c,d,e,sum=0,k;
while(scanf("%d%d%d%d%d",&a,&b,&c,&d,&e)!=EOF){
	sum=0;

 if(d<e){
	sum=a*b*c-2*d*(a-2*e)*(c-2*e)-2*d*(b-2*e)*(a-2*e)-2*d*(c-2*e)*(b-2*e);
}
else if(d>=e){
	if(2*d>=a||2*d>=b||2*d>=c){
	sum=4*(a-2*e)*e*e+4*c*e*e+4*(b-2*e)*e*e;
}
	else{
    sum=4*(a-2*e)*e*e+4*c*e*e+4*(b-2*e)*e*e;
	k=(a-2*d)*(b-2*d)*(c-2*d);
	if(k>sum){
		sum=k;
}
	}
}
printf("%d\n",sum);
}
}