#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 (d<e)
		{
			printf("%d\n",a*b*c-2*(a-2*e)*(c-2*e)*d-2*(a-2*e)*(b-2*e)*d-2*(b-2*e)*(c-2*e)*d);
		}
		else 
		{
			int in,out;
			in=(a-2*d)*(b-2*d)*(c-2*d);
			out=4*(a-2*e)*e*e+4*(b-2*e)*e*e+4*(c-2*e)*e*e+e*e*e*8;
            if (in>=out)
            printf("%d\n",in);
            else
            printf("%d\n",out);
		}
	}
	
}