#include <stdio.h>

int main() {
	
	int a,b,c,d,e,r,v;
	while(scanf("%d %d %d %d %d",&a,&b,&c,&d,&e)!=EOF) {
		if(d>=e) {
			v=(a-2*d)*(b-2*d)*(c-2*d);
			r=(a*b*e-(a-2*e)*(b-2*e)*e)*2+(c-2*e)*e*e*4;
			if(v>r) {
				r=v;
			}
		}else if(d<e){
			r=a*b*c-(c-2*e)*(a-2*e)*d*2-(b-2*e)*(c-2*e)*d*2-(b-2*e)*(a-2*e)*d*2;
		}
		printf("%d\n",r);
	}
	
	return 0;
}