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