#include<stdio.h>
int main(){
	int T;
	int a,b,c,e,d;
	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)*(b-2*e)*d-2*(b-2*e)*(c-2*e)*d-2*(a-2*e)*(c-2*e)*d);
		}else{
			if (d<=a/2&&d<=b/2&&d<=c/2){
			    if((a*b*c - (a-2*e)*(b-2*e)*(c-2*e)-2*(a-2*e)*(b-2*e)*e-2*(b-2*e)*(c-2*e)*e-2*(a-2*e)*(c-2*e)*e) >= (a-2*d)*(b-2*d)*(c-2*d)){
			        printf("%d\n",a*b*c - (a-2*e)*(b-2*e)*(c-2*e)-2*(a-2*e)*(b-2*e)*e-2*(b-2*e)*(c-2*e)*e-2*(a-2*e)*(c-2*e)*e);
		        }else{
		    	    printf("%d\n",(a-2*d)*(b-2*d)*(c-2*d));
			    }
			} else{
				printf("%d\n",a*b*c - (a-2*e)*(b-2*e)*(c-2*e)-2*(a-2*e)*(b-2*e)*e-2*(b-2*e)*(c-2*e)*e-2*(a-2*e)*(c-2*e)*e);
			}
			
		} 
	}
	return 0;
}