/*ABCDEFI
*/
#include <stdio.h>
int main (void){
	int T,a,b,c,d,e,V1,V2,V3,Vres,Vs;
	while(scanf("%d %d %d %d %d",&a,&b,&c,&d,&e)!=EOF){
		V1=(a-2*e)*(c-2*e)*d;
		V2=(b-2*e)*(c-2*e)*d;
		V3=(a-2*e)*(b-2*e)*d;
		if(d<e)
		{
			Vres=a*b*c-2*(V1+V2+V3);
		}else
		{
			Vs=(a-2*d)*(b-2*d)*(c-2*d);
			Vres=4*e*e*(a+c+b-6*e)+8*e*e*e;
			if(Vs>Vres)
			{
				Vres=Vs;
			}
		}
		printf("%d\n",Vres);
	}
	return 0;
}