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

	
}