#include<stdio.h>
int main()
{
	int a,b,c,d,e,y,m,v,p,q,w;
	while(scanf("%d %d %d %d %d",&a,&b,&c,&d,&e)!=EOF){
	    y=(a*b*c);
		if(a-(2*d)>0&&b-(2*d)>0&&c-(2*d)>0)
		{
		q=(a-(2*d))*(b-(2*d))*(c-(2*d));
		}
		else{q=0;}
        w=8*e*e*e+(4*((a-2*e)*e*e))+(4*((b-2*e)*e*e))+(4*((c-2*e)*e*e));
		m=(2*(b-(2*e))*d*(c-(2*e)));
		v=(2*(a-(2*e))*d*(c-(2*e)));
		p=(2*(b-(2*e))*d*(a-(2*e)));
		if(d<e){
			printf("%d\n",y-m-v-p);}
		else
		{
			if(q<w){
			printf("%d\n",w);}
			else
			{
			printf("%d\n",q);}
		}
	}
	return 0;
}