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