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