#include<stdio.h>
#include<math.h>
int min(int x,int y){
	return x<y?x:y;
}
int max(int x,int y){
	return x>y?x:y;
}
int main()
{

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