#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cmath>
#include<cstring>
#include<set>
#define ll long long
using namespace std;
const int maxn = 201000;
const int inf = 0x3f3f3f3f;
int main()
{
	int a,b,c,d,e,v1,v2,x;
	while(~scanf("%d %d %d %d %d",&a,&b,&c,&d,&e))
	{
		v1=a*b*c-2*d*((a-2*e)*(c-2*e)+(a-2*e)*(b-2*e)+(b-2*e)*(c-2*e));
		x=(a-2*d)*(b-2*d)*(c-2*d);
		v2=4*e*e*c+4*e*e*(a-2*e)+4*e*e*(b-2*e);
		if(e>d)
		cout<<v1<<endl;
		if(e<=d&x>=v2)
		cout<<x<<endl;
		if(e<=d&x<v2)
		cout<<v2<<endl;
	}
	return 0;
}