#include<stdio.h>
int main(){
	int i,j,temp,a,b,c,d,e,v;
	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)*d*2-(a-2*e)*(c-2*e)*d*2-(b-2*e)*(c-2*e)*d*2;
		else{
			if((a*b*c-(a-2*e)*(b-2*e)*c-(a-2*e)*(c-2*e)*e*2-(b-2*e)*(c-2*e)*e*2)>=((a-2*d)*(b-2*d)*(c-2*d)))
				v=a*b*c-(a-2*e)*(b-2*e)*c-(a-2*e)*(c-2*e)*e*2-(b-2*e)*(c-2*e)*e*2;
			else
				v=(a-2*d)*(b-2*d)*(c-2*d);
		}
		printf("%d\n",v);		
	}
	return 0;
}