#include<stdio.h>
int main(){
	int a,b,c,d,e;
	while(~scanf("%d %d %d %d %d",&a,&b,&c,&d,&e)){
		if(e>0&&e<a/2&&e<b/2&&e<c/2){
			if(d<e){
				printf("%d\n",a*b*c-(a-2*e)*(b-2*e)*d*2-(a-2*e)*(c-2*e)*d*2-(b-2*e)*(c-2*e)*d*2);
			}
			if(d>=e){
				if((a*b*c-(a-2*e)*(b-2*e)*(c-2*e)-(a-2*e)*(b-2*e)*e*2-(a-2*e)*(c-2*e)*e*2-(b-2*e)*(c-2*e)*e*2)>=((a-2*d)*(b-2*d)*(c-2*d))){
					printf("%d\n",a*b*c-(a-2*e)*(b-2*e)*(c-2*e)-(a-2*e)*(b-2*e)*e*2-(a-2*e)*(c-2*e)*e*2-(b-2*e)*(c-2*e)*e*2);
				}
				else{
					printf("%d\n",(a-2*d)*(b-2*d)*(c-2*d));
				}
			}
		}
	}
}