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