#include<bits/stdc++.h>
using namespace std;

#pragma GCC optimize("Ofast")

#define rep(i,n) for(ll i=0;i<n;i++)
#define repl(i,l,r) for(ll i=(l);i<(r);i++)
#define per(i,n) for(ll i=(n)-1;i>=0;i--)
#define perl(i,r,l) for(ll i=r-1;i>=l;i--)
#define fi first
#define se second
#define pb push_back
#define ins insert
#define pqueue(x) priority_queue<x,vector<x>,greater<x>>
#define all(x) (x).begin(),(x).end()
#define CST(x) cout<<fixed<<setprecision(x)
#define rev(x) reverse(x);
using ll=long long;
using vl=vector<ll>;
using vvl=vector<vector<ll>>;
using pl=pair<ll,ll>;
using vpl=vector<pl>;
using vvpl=vector<vpl>;
const ll MOD=1000000007;
const ll MOD9=998244353;
const int inf=1e9+10;
const ll INF=4e18;
const ll dy[8]={1,0,-1,0,1,1,-1,-1};
const ll dx[8]={0,1,0,-1,1,-1,1,-1};
template <typename T> inline bool chmax(T &a, T b) {
  return ((a < b) ? (a = b, true) : (false));
}
template <typename T> inline bool chmin(T &a, T b) {
  return ((a > b) ? (a = b, true) : (false));
}

int main(){
  ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  ll gx,gy,n,f;cin >> gx >> gy >> n >> f;
  vvl dp(110,vl(110,INF));dp[0][0]=0;
  rep(i,n){
    ll x,y,c;cin >> x >> y >> c;
    per(j,110){
      per(k,110){
        if(j+x<110&&k+y<110)chmin(dp[j+x][k+y],dp[j][k]+c);
      }
    }
  }
  ll ans=INF;
  rep(i,gx+1){
    rep(j,gy+1){
      chmin(ans,dp[i][j]+(gx-i+gy-j)*f);
    }
  }
  cout << ans << endl;
}