#include<stdio.h>
#include<stdlib.h>

int main()
{
	int a,b,c,d,e;
	int v;
	int v1,v2;
	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)*2*d-(a-2*e)*(c-2*e)*2*d-(c-2*e)*(b-2*e)*2*d;
			printf("%d\n",v);
		}
		else
		{
			
			v1=a*b*c-(a-2*e)*(b-2*e)*2*e-(a-2*e)*(c-2*e)*2*e-(c-2*e)*(b-2*e)*2*e-(a-2*e)*(b-2*e)*(c-2*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;
}