#include <stdio.h>

int main(){
	int a, b, c, d, e;
	int v, v1, v2, v3;
	while(scanf("%d %d %d %d %d", &a, &b, &c, &d, &e)!=EOF){
		if (e>d ){
			v = a*b*c - 2*((a-2*e)*d*(c-2*e)+(b-2*e)*d*(c-2*e)+d*(a-2*e)*(b-2*e));
			printf("%d\n", v);
		}else{
			v = a*b*c - 2*((a-2*e)*e*(c-2*e)+(b-2*e)*e*(c-2*e)+e*(a-2*e)*(b-2*e)) - (b-2*e)*(c-2*e)*(a-2*e);
			v1 = (b-2*d)*(c-2*d)*(a-2*d);
			if (v>v1)
			printf("%d\n", v);
			else
			printf("%d\n", v1);
 		}
	}
	return 0;
}