#include <bits/stdc++.h>
using namespace std;
#define rep(i, x, limit) for (long long i = (long long)x; i < (long long)limit; i++)
#define REP(i, x, limit) for (long long i = (long long)x; i <= (long long)limit; i++)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define el '\n'
#define spa " "
#define Yes cout << "Yes" << el
#define No cout << "No" << el
#define YES cout << "YES" << el
#define NO cout << "NO" << el
#define inp(x) for(auto &i:x)cin>>i
#define eps (1e-10)
#define Equals(a,b) (fabs((a) - (b)) < eps )
#define debug(x) cerr << #x << " = " << x << el
using ll = long long;
using ull = unsigned long long;
using i128 = __int128_t;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
using vi = vector<int>;
using vl = vector<ll>;
using vvl = vector<vector<ll>>;
using vs = vector<string>;
using vb = vector<bool>;
const double pi = 3.141592653589793238;
const int inf = 1073741823;
const ll infl = 1LL << 60;
const string ABC = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const string abc = "abcdefghijklmnopqrstuvwxyz";
const ll MOD = 998244353;
#include<atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using vm = vector<mint>;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  ll h,w,sx,sy,n;cin>>h>>w>>sx>>sy>>n;
  auto J=[&](pll A,pll B)->bool{
    auto [ax,ay]=A;
    auto [bx,by]=B;
    if(ax==bx||ay==by)return true;
    if(abs(ax-bx)==abs(ay-by))return true;
    return false;
  };
  vvl dp(n,vl(2,0));
  vb F(n);
  vl C(n);
  vector<pll> XY(n);
  rep(i,0,n){
    ll x,y,c;cin>>x>>y>>c;
    XY[i]={x,y};
    C[i]=c;
  }
  rep(i,0,n){
    if(i==0){
      F[i]=J({sx,sy},XY[i]);
    }else{
      F[i]=J(XY[i-1],XY[i]);
    }
  }
  rep(i,0,n){
    if(i==0){
      if(F[i])dp[i][0]=C[i];
    }else{
      dp[i][1]=max(dp[i-1][0],dp[i-1][1]);
      if(F[i])dp[i][0]=dp[i][1]+C[i];
      else dp[i][0]=dp[i-1][1]+C[i];
    }
  }
  cout<<max(dp[n-1][0],dp[n-1][1])<<el;
}