#include <bits/stdc++.h>
#define ull unsigned ll
#define ll long long
#define ld long double
#define INFL (ll)3e18
#define INF (int)2e9
#define MOD (ll)998244353
#define MODO (ll)(1e9+7)
using namespace std;

template<typename T>istream&operator>>(istream&is,vector<T>&v);
template<typename... Ts>istream&operator>>(istream&is,tuple<Ts...>& t);
template<typename T1,typename T2>istream&operator>>(istream&is,pair<T1,T2>&p){is>>p.first>>p.second;return is;}
template<typename T>istream&operator>>(istream&is,vector<T>&v){for(T&in:v)is>>in;return is;}
template<typename... Ts>istream& operator>>(istream& is, tuple<Ts...>& t) {apply([&](auto&... args) {((is >> args), ...);},t);return is;}

int main(void){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int h,w;
    cin >> h >> w;
    pair<int,int> s;
    cin >> s;
    int n;
    cin >> n;
    
    vector<vector<ll>> sc(n,vector<ll>(3));
    cin >> sc;
    vector<ll> dp(n);
    vector<ll> ma(n);
    
    ll px = s.first,py = s.second;
    
    for(int i = 0;i < n;i++){
        ll x = sc[i][0],y = sc[i][1],c = sc[i][2];
        dp[i] = c;
        if(i == 0 && !(x == px || y == py || x-y == px-py || x+y == px+py)){
            dp[i] = 0;
        }
        if(i >= 2) dp[i] = max(dp[i],ma[i-2]+c);
        if(i > 0 && (x == px || y == py || x-y == px-py || x+y == px+py)){
            dp[i] = max(dp[i],dp[i-1]+c);
        }
        px = x,py = y;
        ma[i] = dp[i];
        if(i > 0) ma[i] = max(ma[i],ma[i-1]);
    }
    
    cout << ma[n-1] << endl;
}