#include<stdio.h>
int main(){
	int a,b,c,d,e,sum,sum1,sum2;
	while(scanf("%d %d %d %d %d",&a,&b,&c,&d,&e)!=EOF){
	if(d<e){
	sum=a*b*c-(a-2*e)*(b-2*e)*d*2-(c-2*e)*(b-2*e)*d*2-(a-2*e)*(c-2*e)*d*2;	
	}
	else{
		sum1=a*b*c-(a-2*e)*(c-2*e)*b-2*e*(b-2*e)*(c-2*e)-2*e*(a-2*e)*(b-2*e);
		sum2=(a-2*d)*(b-2*d)*(c-2*d);
		if(sum1>sum2){
			sum=sum1;
		}
		else{
			sum=sum2;
		}
	}
	printf("%d\n",sum);
}
	return 0;
}