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