#define LOCAL
#define _USE_MATH_DEFINES
#include <array>
#include <cassert>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <iomanip>
#include <string>
#include <sstream>
#include <vector>
#include <queue>
#include <stack>
#include <list>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <algorithm>
#include <complex>
#include <cmath>
#include <numeric>
#include <bitset>
#include <functional>
#include <random>
#include <ctime>

using namespace std;

template <typename A, typename B>
ostream& operator <<(ostream& out, const pair<A, B>& a) {
  out << "(" << a.first << "," << a.second << ")";
  return out;
}
template <typename T, size_t N>
ostream& operator <<(ostream& out, const array<T, N>& a) {
  out << "["; bool first = true;
  for (auto& v : a) { out << (first ? "" : ", "); out << v; first = 0;} out << "]";
  return out;
}
template <typename T>
ostream& operator <<(ostream& out, const vector<T>& a) {
  out << "["; bool first = true;
  for (auto& v : a) { out << (first ? "" : ", "); out << v; first = 0;} out << "]";
  return out;
}
template <typename T, class Cmp>
ostream& operator <<(ostream& out, const set<T, Cmp>& a) {
  out << "{"; bool first = true;
  for (auto& v : a) { out << (first ? "" : ", "); out << v; first = 0;} out << "}";
  return out;
}
template <typename U, typename T, class Cmp>
ostream& operator <<(ostream& out, const map<U, T, Cmp>& a) {
  out << "{"; bool first = true;
  for (auto& p : a) { out << (first ? "" : ", "); out << p.first << ":" << p.second; first = 0;} out << "}";
  return out;
}
#ifdef LOCAL
#define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)
#else
#define trace(...) 42
#endif
template <typename Arg1>
void __f(const char* name, Arg1&& arg1){
  cerr << name << ": " << arg1 << endl;
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args){
  const char* comma = strchr(names + 1, ',');
  cerr.write(names, comma - names) << ": " << arg1 << " |";
  __f(comma + 1, args...);
}

typedef long long int64;
typedef pair<int, int> ii;
const int INF = 1 << 29;
const int MOD = 1e9 + 7;
mt19937 mrand(random_device{}());
int rnd(int x) { return mrand() % x; }

struct fast_ios {
  fast_ios() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);
  };
} fast_ios_;

const int N = 2e5 + 10;
int f[N], e[N];
int find(int x) {
  if (f[x] != f[f[x]]) f[x] = find(f[x]);
  return f[x];
}

int main() {
  int len, n, m;
  scanf("%d%d%d", &len, &n, &m);
  vector<array<int, 3>> a(len);
  for (int i = 0; i < len; ++i) {
    int x, y, v;
    scanf("%d%d%d", &x, &y, &v);
    --x; --y;
    a[i] = {v, x, y + n};
  }
  for (int i = 0; i < n + m; ++i) {
    f[i] = i;
    e[i] = 1;
  }
  sort(a.begin(), a.end());
  int64 ret = 0;
  for (int i = len - 1; i >= 0; --i) {
    int x = a[i][1], y = a[i][2];
    int rx = find(x), ry = find(y);
    if (rx != ry) {
      if (e[rx] + e[ry] >= 1) {
        f[ry] = rx;
        e[rx] += e[ry] - 1;
        ret += a[i][0];
      }
    } else {
      if (e[rx] >= 1) {
        e[rx] -= 1;
        ret += a[i][0];
      }
    }
  }
  printf("%lld\n", ret);
  return 0;
}


Measured memory_bytes: 3584