# include<stdio.h>
int main(void){
	int a,b,c,d,e,v1,v2,max;
	while(scanf("%d%d%d%d%d",&a,&b,&c,&d,&e)!=EOF){
		if(d>=e){ 
			v1=a*b*c-2*(a-2*e)*(b-2*e)*e-2*(a-2*e)*(c-2*e)*e-2*(c-2*e)*(b-2*e)*e-(a-2*e)*(b-2*e)*(c-2*e);
	    	v2=(a-2*d)*(b-2*d)*(c-2*d); 
	    	if(v1>=v2)
	    	   max=v1;
	    	else
	    	   max=v2;
		} 
		else
		    max=a*b*c-2*(a-2*e)*(b-2*e)*d-2*(a-2*e)*(c-2*e)*d-2*(c-2*e)*(b-2*e)*d; 
			printf("%d\n",max);
	}
	return 0;	
}