#include <stdio.h>

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