#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<ll,ll> P;
#define REP(i,n) for(ll i=0;i<ll(n);i++)




bool f(ll x,ll y,ll xx,ll yy){
	if(x==xx || y==yy || llabs(x-xx)==llabs(yy-y)) return true;
	else return false;
}

ll dp[500010];







int main(void){
	cin.tie(nullptr);  ios_base::sync_with_stdio(false);
	ll i,j;



	ll H,W,sx,sy,N;
	cin >> H >> W >> sx >> sy >> N;

	vector<ll> x(N+1,0),y(N+1,0),c(N+1,0);
	for(i=1;i<=N;i++)cin >> x[i] >> y[i] >> c[i];

	if(f(sx,sy,x[1],y[1])) dp[1]=c[1];
	for(i=2;i<=N;i++){
		if(f(x[i-1],y[i-1],x[i],y[i])) dp[i]=max(dp[i-1]+c[i],dp[i-2]+c[i]);
		else dp[i]=max(dp[i-2]+c[i],dp[i-1]);
	}




	cout << dp[N] << endl;







	return 0;

}