#include<stdio.h>
int main(){
	int a,b,c,d,e,V,V1,V2;
	while(scanf("%d%d%d%d%d",&a,&b,&c,&d,&e)!=EOF){
		V=a*b*c;
		if(d<e){
			V1=V-(a-2*e)*(c-2*e)*d*2-(b-2*e)*(c-2*e)*2*d-(b-2*e)*(a-2*e)*2*d;
			printf("%d\n",V1);
		}
		
		else{
			if(2*d>=a||2*d>=b||2*d>=c){
				V1=(c*e*e*4)+(b*e*e*4)+(a*e*e*4)-(16*e*e*e); 
				printf("%d\n",V1);
			}
			else{
				V2=(a-2*d)*(b-2*d)*(c-2*d);
				V1=(c*e*e*4)+(b*e*e*4)+(a*e*e*4)-(16*e*e*e);
				if(V1>=V2)
				printf("%d\n",V1);
				else
				printf("%d\n",V2);
			}

		}
		
	}
	
	
	return 0;
}