#include <bits/stdc++.h>
#define int long long
#define ll long long
using ull = unsigned long long;
using namespace std;
#define dump(x)                             \
    if (dbg) {                              \
        cerr << #x << " = " << (x) << endl; \
    }
#define overload4(_1, _2, _3, _4, name, ...) name
#define FOR1(n) for (ll i = 0; i < (n); ++i)
#define FOR2(i, n) for (ll i = 0; i < (n); ++i)
#define FOR3(i, a, b) for (ll i = (a); i < (b); ++i)
#define FOR4(i, a, b, c) for (ll i = (a); i < (b); i += (c))
#define FOR(...) overload4(__VA_ARGS__, FOR4, FOR3, FOR2, FOR1)(__VA_ARGS__)
#define FORR(i, a, b) for (int i = (a); i <= (b); ++i)
#define bit(n, k) ((n >> k) & 1) /*nのk bit目*/
namespace mydef {
const int INF = 1ll << 60;
const int MOD = 1e9 + 7;
template <class T>
bool chmin(T& a, const T& b) {
    if (a > b) {
        a = b;
        return 1;
    } else
        return 0;
}
template <class T>
bool chmax(T& a, const T& b) {
    if (a < b) {
        a = b;
        return 1;
    } else
        return 0;
}
void Yes(bool flag = true) {
    if (flag)
        cout << "Yes" << endl;
    else
        cout << "No" << endl;
}
void No(bool flag = true) {
    Yes(!flag);
}
void YES(bool flag = true) {
    if (flag)
        cout << "YES" << endl;
    else
        cout << "NO" << endl;
}
void NO(bool flag = true) {
    YES(!flag);
}
template <typename A, size_t N, typename T>
void Fill(A (&array)[N], const T& val) {
    std::fill((T*)array, (T*)(array + N), val);
}
bool dbg = false;
}  // namespace mydef
using namespace mydef;
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define lb lower_bound
#define ub upper_bound
#define all(v) (v).begin(), (v).end()
#define SZ(x) ((int)(x).size())
#define vi vector<int>
#define vvi vector<vector<int>>
#define vp vector<pair<int, int>>
#define vvp vector<vector<pair<int, int>>>
#define pi pair<int, int>
//#define P pair<int, int>
//#define V vector<int>
//#define S set<int>
#define asn ans
//UnionFind
//How to use
//unite(x,y) : 集合 x と y を併合する. 併合済のとき false, 未併合のとき true が返される
//find(k) : 要素 k が属する集合を求める
//size(k) : 要素 k が属する集合の要素の数を求める
struct UnionFind {
    vector<int> data;

    UnionFind(int sz) {
        data.assign(sz, -1);
    }

    bool unite(int x, int y) {
        x = find(x), y = find(y);
        if (x == y)
            return (false);
        if (data[x] > data[y])
            swap(x, y);
        data[x] += data[y];
        data[y] = x;
        return (true);
    }

    int find(int k) {
        if (data[k] < 0)
            return (k);
        return (data[k] = find(data[k]));
    }

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

    int size(int k) {
        return (-data[find(k)]);
    }
};

int N, H, W;
int R[101010], A[101010], B[101010];
int used[202020];

void solve() {
    priority_queue<pair<int, pi>> que;
    for (int i = 0; i < N; i++) {
        que.push({R[i], {A[i], B[i] + 101010}});
    }

    UnionFind uf(202020);


    int ans = 0;
    while (!que.empty()) {
        auto t = que.top();
        que.pop();
        int R = t.first, A = t.second.first, B = t.second.second;
        bool fa = used[uf.find(A)], fb = used[uf.find(B)];
        if (fa && fb)
            continue;
        if (fa) {
            ans += R;
            used[uf.find(B)] = 1;
        } else if (fb) {
            ans += R;
            used[uf.find(A)] = 1;
        } else {
            ans += R;
            if (uf.same(A, B)) {
                used[uf.find(A)] = 1;
            } else {
                uf.unite(A, B);
            }
        }
    }

    cout << ans << endl;
}

signed main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    cin >> N >> H >> W;
    for (int i = 0; i < N; i++) {
        cin >> A[i] >> B[i] >> R[i];
    }

    solve();
    return 0;
}


Measured memory_bytes: 10900