#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-((a-2*e)*(b-2*e)+(b-2*e)*(c-2*e)+(c-2*e)*(a-2*e))*2*d;
		}
		else if(d>=e){
			v1=(a-2*d)*(b-2*d)*(c-2*d);
			v2=a*b*c-((a-2*e)*(b-2*e)+(b-2*e)*(c-2*e)+(c-2*e)*(a-2*e))*2*e-(a-2*e)*(b-2*e)*(c-2*e);
			if(v1>v2){
				v=v1;}
			else{
				v=v2;
			}
		}
		printf("%d\n",v);
	}
	return 0;
}