#include<iostream>
#include<cstdio>
using namespace std;
int main(){
	int w,x,h;
	cin>>w>>x>>h;
	bool m[w][x][h]={0};
	int n;
	cin>>n;
	int q[n][6];
	for(int i=0;i<n;i++){
		for(int j=0;j<6;j++){
			cin>>q[i][j];
		}
	}
	int count=0;
	for(int i=0;i<n;i++){
		for(int t1=0;t1<w;t1++){
			for(int t2=0;t2<x;t2++){
				for(int t3=0;t3<h;t3++){
					//printf("%d %d %d\n",t1,t2,t3);
					if(m[t1][t2][t3]==1)continue;
					if((t1<q[i][0])||(t1>q[i][3]))continue;
					if((t2<q[i][1])||(t2>q[i][4]))continue;
					if((t3<q[i][2])||(t3>q[i][5]))continue;
					m[t1][t2][t3]=1;
					count++;
				}
			}
		}
	}
	cout<<(w*x*h)-count;
}