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