#include<stdio.h>
int main()
{
	int w,a,h,q;
	int x1,x2,y1,y2,z1,z2;
	int sd;
	scanf("%d %d %d",&w,&a,&h);
	scanf("%d",&q);
	sd=w*a*h;
	while(q--)
	{
		scanf("%d %d %d %d %d %d",&x1,&y1,&z1,&x2,&y2,&z2);
		sd=sd-(x2-x1+1)*(y2-y1+1)*(z2-z1+1);
	}
	printf("%d",sd);
	return 0;
}