#include <stdio.h>

int size(int x,int y,int z,int s) {
	int output;
	output = z * (x - 2 * s) * (y - 2 * s);
	return output;
}

int main () 
{
	int a,b,c,d,e;
	int all;
	int result;
	int u;
	
	while(scanf("%d %d %d %d %d",&a,&b,&c,&d,&e) != EOF) 
	{
	
	    all = a * b * c;
	
    	if (d < e) 
		{
    		result = all - 2 * size(a,c,d,e) - 2 * size(b,c,d,e) - 2 * size(a,b,d,e);
    		printf("%d\n",result);
    		result = 0;
	    } 
		else if (2 * d >= a || 2 * d >= c || 2 * d >= b)
		{
	    	result = all - 2 * size(a,c,e,e) - 2 * size(b,c,e,e) - 2 * size(a,b,e,e) - (a - 2 * e) * (b - 2 * e) * (c - 2 * e);
	    	printf("%d\n",result);
	    	result = 0;
		} 
		else 
		{

			result = all - 2 * size(a,c,e,e) - 2 * size(b,c,e,e) - 2 * size(a,b,e,e) - (a - 2 * e) * (b - 2 * e) * (c - 2 * e);
			u = (a - 2 * d) * (b - 2 * d) * (c - 2 * d);
			
			if (result < u) {
				printf("%d\n",u);
			} else {
				printf("%d\n",result);
			}
		}
	}
	return 0;
}