#include <stdio.h>
int main (void){
	int a,b,c,d,e,V1,V2,max;
	while(scanf("%d %d %d %d %d",&a,&b,&c,&d,&e)!=EOF){
	    if (d>=e){
	    	V1=a*b*c-((a-2*e)*(b-2*e)+(b-2*e)*(c-2*e)+(a-2*e)*(c-2*e))*2*e-(a-2*e)*(c-2*e)*(b-2*e);
		    V2=(a-2*d)*(b-2*d)*(c-2*d);
		    if (V1>=V2){
		        max=V1;
	        }
	        else{
		        max=V2;
	        }
	    }
	    else{
	    	max=a*b*c-2*(a-2*e)*(b-2*e)*d-2*(a-2*e)*(c-2*e)*d-2*(b-2*e)*(c-2*e)*d;
		}
		printf("%d\n",max);
    } 
	return 0;
}