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