#include<stdio.h>
int main()
{
	int a,b,c,d,e,v,v1,v2,v3,v4;
	while(scanf("%d",&a)!=EOF)
	{
		scanf("%d %d %d %d",&b,&c,&d,&e);
		v=a*b*c;
		if(d<e)
		{
			v1=(a-2*e)*(c-2*e)*d;
			v2=(b-2*e)*(c-2*e)*d;
			v3=(a-2*e)*(b-2*e)*d;
			printf("%d\n",v-2*v1-2*v2-2*v3);
		}
		else
		{
		     v=e*e*e*8+(a-2*e)*e*e*4+(b-2*e)*e*e*4+(c-2*e)*e*e*4;
		     v4=(a-2*d)*(b-2*d)*(c-2*d);
		     if(v>v4)
		     printf("%d\n",v);
		     else
		     printf("%d\n",v4);
		}
    }
}