#include<stdio.h>
#include<string.h>
int main()
{
	int v;
	int a,b,c,d,e,v1,v2,v3,v4,f;
	while(scanf("%d %d %d %d %d",&a,&b,&c,&d,&e)!=EOF)
	{
		if(d<e)
		{
			v=a*b*c;
			if(b>=2*d)
				v-=2*d*(a-2*e)*(c-2*e);
			else
				v-=b*(a-2*e)*(c-2*e);
			if(c>=2*d)
				v-=2*d*(a-2*e)*(b-2*e);
			else
				v-=b*(a-2*e)*(b-2*e);
			if(a>=2*d)
				v-=2*d*(b-2*e)*(c-2*e);
			else
				v-=b*(b-2*e)*(c-2*e);
		}
		else
		{
			v = 8*e*e*e + 4*e*(a-2*e)*e + 4*e*(b-2*e)*e + 4*e*(c-2*e)*e;
			v1 = (a-2*d)*(c-2*d)*(b-2*d);
			v = v>v1?v:v1;
		}
		printf("%d\n",v);
	}
	return 0;
}