#include <bits/stdc++.h>
#define whlie while
#define pb push_back
#define eb emplace_back
#define fi first
#define se second
#define rep(i,N) for(int i = 0; i < (N); i++)
#define repr(i,N) for(int i = (N) - 1; i >= 0; i--)
#define rep1(i,N) for(int i = 1; i <= (N) ; i++)
#define repr1(i,N) for(int i = (N) ; i > 0 ; i--)
#define each(x,v) for(auto& x : v)
#define all(v) (v).begin(),(v).end()
#define sz(v) ((int)(v).size())
#define ini(...) int __VA_ARGS__; in(__VA_ARGS__)
#define inl(...) ll __VA_ARGS__; in(__VA_ARGS__)
#define ins(...) string __VA_ARGS__; in(__VA_ARGS__)
using namespace std; void solve();
using ll = long long; using vl = vector<ll>;
using vi = vector<int>; using vvi = vector< vector<int> >;
constexpr int inf = 1001001001;
constexpr ll infLL = (1LL << 61) - 1;
struct IoSetupNya {IoSetupNya() { cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(15); cerr << fixed << setprecision(7);} } iosetupnya;
template<typename T, typename U> inline bool amin(T &x, U y) { return (y < x) ? (x = y, true) : false; }
template<typename T, typename U> inline bool amax(T &x, U y) { return (x < y) ? (x = y, true) : false; }
template<typename T, typename U> ostream& operator <<(ostream& os, const pair<T, U> &p) { os << p.first << " " << p.second; return os; }
template<typename T, typename U> istream& operator >>(istream& is, pair<T, U> &p) { is >> p.first >> p.second; return is; }
template<typename T> ostream& operator <<(ostream& os, const vector<T> &v) { int s = (int)v.size(); rep(i,s) os << (i ? " " : "") << v[i]; return os; }
template<typename T> istream& operator >>(istream& is, vector<T> &v) { for(auto &x : v) is >> x; return is; }
void in(){} template <typename T,class... U> void in(T &t,U &...u){ cin >> t; in(u...);}
void out(){cout << "\n";} template <typename T,class... U> void out(const T &t,const U &...u){ cout << t; if(sizeof...(u)) cout << " "; out(u...);}
template<typename T>void die(T x){out(x); exit(0);}
#ifdef NyaanDebug
  #include "NyaanDebug.h"
  #define trc(...) do { cerr << #__VA_ARGS__ << " = "; dbg_out(__VA_ARGS__);} while(0)
  #define trca(v,N) do { cerr << #v << " = "; array_out(v , N);cout << endl;} while(0)
#else
  #define trc(...)
  #define trca(...)
  int main(){solve();}
#endif
//using P = pair<ll,ll>; using vp = vector<P>;
constexpr int MOD = /** 1000000007; //*/ 998244353;
////////////////


template< typename T >
struct edge {
  int src, to;
  T cost;

  edge(int to) : src(-1) , to(to) , cost(0){}
  edge(int to, T cost) : src(-1), to(to), cost(cost) {}
  edge(int src, int to, T cost) : src(src), to(to), cost(cost) {}

  edge &operator=(const int &x) { // edge e = n; とできる(e.to = n)
    to = x;
    return *this;
  }

  // int()をオーバーロードすることで重み付きグラフと普通のグラフでライブラリを共用できる
  operator int() const { return to; } // v[e]とできる ( v[e.to]に同じ )

};

// sort用 とりあえずcostの小さいほうが左としているが適宜書き換えて使いましょう
/**
template<typename T>
bool operator <(const edge<T>& e1,const edge<T>& e2){ 
  return e1.cost < e2.cost;
}//*/
template< typename T >
using Edges = vector< edge< T > >;
template< typename T >
using WG = vector< Edges< T > >;
template< typename T>
using UWG = vector< vector <int> >;

// Union-Find木
// 初期化 UF(N); Nは要素数
// 結合 unite(x,y); 同じ集合か判定 same(x,y);
// 集合の数 count
struct UF{
  vector<int> par,sizes;
  int cnt;
  UF(int N) : par(N),sizes(N, 1),cnt(N){ for(int i=0; i<N; i++) par[i]=i; }

  int find(int x){ return par[x]==x ? x : par[x] = find(par[x]); }

  bool same(int x,int y){ return find(x) == find(y); }

  int size(int x){ return sizes[find(x)]; }

  void unite(int x, int y){
    x = find(x); y = find(y);
    if(x == y) return;
    if(sizes[x] < sizes[y]) swap(x,y);
    par[y] = x;
    sizes[x] += sizes[y];
    cnt--;
  }
  
  int count() const{return cnt;}
};

void solve(){
  ini(N , H , W);
  UF uf(H + W);
  Edges<ll> es;
  rep(i , N){
    ini(h , w , c); h--; w--;
    es.eb(h , w + H , c);
  }

  sort(all(es) , [](edge<ll> &a,edge<ll> &b){
    return a.cost > b.cost;
  });

  vi cnt(H + W , 0);
  ll ans = 0;
  each(e , es){
    int a = e.src , b = e.to;
    int sn , en;
    sn = uf.size(a) , en = cnt[uf.find(a)];
    if(!uf.same(a , b)) sn += uf.size(b) , en += cnt[uf.find(b)];
    if(sn > en){
      cnt[uf.find(a)] = cnt[uf.find(b)] = 0;
      uf.unite(a , b);
      cnt[uf.find(a)] = en + 1;
      ans += e.cost;
    }
  }
  out(ans);

}

Measured memory_bytes: 4980