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