#include<stdio.h>
int main()
{
	int longe,wide,height,n,i,j,sum,num;
	int min=1,max=1;
	int two[6];
	scanf("%d%d%d",&longe,&wide,&height);
	scanf("%d",&n);
	sum=longe*wide*height;
	for(i=0;i<n;i++)
	{
		for(j=0;j<6;j++)
		{
			scanf("%d",&two[j]);
			if(j<3){
				min*=two[j];
			}
			else{
				max*=two[j];
			}
			
		}
		num=max/min;
		sum-=num;
	}
	printf("%d",sum);
	
	
	return 0;
}