#include<stdio.h>
int main(){
	int w,x,h,q,i,j,k,b,c=0,sum;
	int x1[100],x2[100],y1[100],y2[100],z1[100],z2[100],a[100];
	scanf("%d %d %d",&w,&x,&h);
	scanf("%d",&q);
	for(b=0;b<q;b++){
		scanf("%d %d %d %d %d %d",&x1[b],&y1[b],&z1[b],&x2[b],&y2[b],&z2[b]);
		a[b]=x2[b]*y2[b]*z2[b]-(x1[b]-1)*(y1[b]-1)*(z1[b]-1);
		c=a[b]+c;
	}
	sum=w*h*x-c;
	printf("%d",sum);
	return 0;
}