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