// Slower C++ solution:
#include <bits/stdc++.h>



using namespace std;

#define pb push_back

#define sz(x) ((int)x.size())

#define all(x) x.begin(), x.end()

#define se second

#define fi first



using ll=long long;



using pii=pair<ll, ll>;

const int mn = 2e5 + 5;

const int mod = 1e9 + 7;

int n, h, w;



struct node {

    int x, y, value;



    bool operator<(const node &p) const {

        return value > p.value;

    }

};



namespace Union_find_set {

    int f[mn];

    int sz[mn];// 并查集 i 的大小



    void init(int n) { // 初始化

        for (int i = 1; i <= n; i++) {

            f[i] = i;

            sz[i] = 1;

        }

    }



    int sf(int x) { // 找爸爸

        if (f[x] == x) return x;

        if (sf(f[x]) != f[x]) {

            f[x] = sf(f[x]);

        }

        return f[x];

    }



    void Union(int u, int v) { // 合并

        u = sf(u), v = sf(v);

        if (u != v) {

            f[u] = v;// 把 u 接到 v 尾部

            sz[v] += sz[u];

            sz[u] = 0;

        }

    }



    int getSize(int x) {

        return sz[sf(x)];

    }

}

using namespace Union_find_set;



int main() {

    //cin.sync_with_stdio(0);

#ifdef trote

    freopen("../1.txt", "r", stdin);

#endif

    scanf("%d%d%d", &n, &h, &w);

    init(h + w);

    vector<node> g;

    for (int i = 1; i <= n; i++) {

        int a, b, c;

        scanf("%d%d%d", &a, &b, &c);

        g.pb({a, b, c});

    }

    sort(all(g));

    ll ans = 0;

    for (auto &&p:g) {

        if (sf(p.x) == sf(p.y + h)) {

            if (getSize(p.x) < 1) {

                continue;

            } else {

                sz[sf(p.x)]--;

                ans += p.value;

            }

        } else {

            if (getSize(p.x) + getSize(p.y + h) < 1) {

                continue;

            } else {

                ans += p.value;

                Union(p.x, p.y + h);

                sz[sf(p.x)]--;

            }

        }

    }

    printf("%lld\n", ans);



}

// Faster C++ solution for the same problem (measured speedup: 4.253553507954607x):
#include<cstdio>

#include<algorithm>

using namespace std;

const int MAXN = 100000;

struct node{

    int R, C, A;

    friend bool operator < (node a, node b) {

        return a.A < b.A;

    }

}nd[MAXN + 5];

int fa[2*MAXN + 5], key[2*MAXN + 5], siz[2*MAXN + 5];

int find(int x) {

    return fa[x] = (fa[x] == x ? x : find(fa[x]));

}

int N, H, W;

int main() {

    long long ans = 0;

    scanf("%d%d%d", &N, &H, &W);

    for(int i=1;i<=H;i++) fa[i] = i, siz[i] = 1, key[i] = 0;

    for(int i=1;i<=W;i++) fa[i + H] = i + H, siz[i + H] = 1, key[i + H] = 0;

    for(int i=1;i<=N;i++)

        scanf("%d%d%d", &nd[i].R, &nd[i].C, &nd[i].A);

    sort(nd + 1, nd + N + 1);

    for(int i=N;i>=1;i--) {

        int fx = find(nd[i].R), fy = find(nd[i].C + H);

        if( fx == fy ) {

            if( siz[fx] >= key[fx] + 1 ) {

                key[fx]++;

                ans += nd[i].A;

            }

        }

        else {

            if( siz[fx] + siz[fy] >= key[fx] + key[fy] + 1 ) {

                siz[fx] += siz[fy], key[fx] += key[fy] + 1, fa[fy] = fx;

                ans += nd[i].A;

            }

        }

    }

    printf("%lld\n", ans);

}