#include<bits/stdc++.h>

using namespace std;
int arr[100][100][100];
int main() {
	int w,x,h;
	cin >> w >> x >> h;
	int q,hh;
	cin >> q;
	for(int a,b,d;d <= q;a++,b++,d++){
		cin >> arr[a][b][b] >> arr[b][a][b]>>arr[b][b][a];
	}
	for(int a,b,c,d;d <= q;a++,b++,d++){
		hh += arr[a][b][b] * arr[b][a][b]*arr[b][b][a];
	}
	cout << w*x*h-hh;
	 



	return 0;
}