#include<stdio.h>
int main(){
	int a,b,c,d,e,v1,v2,v;
	while(scanf("%d %d %d %d %d",&a,&b,&c,&d,&e)!=EOF){
	if(d<e){
		v=a*b*c-d*(a-2*e)*(c-2*e)*2-d*(b-2*e)*(c-2*e)*2-d*(a-2*e)*(b-2*e)*2;
	}
	else if(d>=e){
		v1=e*e*e*8+e*e*(a-2*e)*4+e*e*(b-2*e)*4+e*e*(c-2*e)*4;
		v2=(a-2*d)*(b-2*d)*(c-2*d);
		if(v1>=v2)
			v=v1;
		else 
			v=v2;
	}
	printf("%d\n",v);
	}
	return 0;
}