#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define P pair<ll,ll>
#define FOR(I,A,B) for(ll I = ll(A); I < ll(B); ++I)
#define FORR(I,A,B) for(ll I = ll((B)-1); I >= ll(A); --I)
#define TO(x,t,f) ((x)?(t):(f))
#define SORT(x) (sort(x.begin(),x.end())) // 0 2 2 3 4 5 8 9
#define POSL(x,v) (lower_bound(x.begin(),x.end(),v)-x.begin()) //xi>=v  x is sorted
#define POSU(x,v) (upper_bound(x.begin(),x.end(),v)-x.begin()) //xi>v  x is sorted
#define NUM(x,v) (POSU(x,v)-POSL(x,v))  //x is sorted
#define REV(x) (reverse(x.begin(),x.end())) //reverse
ll gcd(ll a,ll b){if(a%b==0)return b;return gcd(b,a%b);}
ll lcm(ll a,ll b){ll c=gcd(a,b);return ((a/c)*(b/c)*c);}
#define NEXTP(x) next_permutation(x.begin(),x.end())
const ll INF=ll(1e18)+ll(7);
const ll MOD=1000000007LL;
#define out(a) cout<<fixed<<setprecision((a))

class UnionFind{
public:
	vector<int> par;
	//0-indexed
	UnionFind(int n){init(n);}
	void init(int n = 1) {
		par.resize(n);
		for (int i = 0; i < n; ++i) par[i] = i;
	}
	int root(int x = 1){
		if(par[x]==x)return x;
		return par[x] = root(par[x]);
	}
	void unite(int x = 1,int y = 1){
		x = root(x);
		y = root(y);
		if(x==y)return;
		par[x] = y;
	}
	bool same(int x,int y){
		return root(x)==root(y);
	}
};


// なもりグラフ
// https://www.hamayanhamayan.com/entry/2019/08/25/090415

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	int N,H,W;
	ll ans = 0;
	cin >> N >> H >> W;
	UnionFind uf(H+W+6);
	priority_queue< pair<ll,P> > pq;
	FOR(i,0,N){
		int r,c,a;
		cin >> r >> c >> a;
		pq.push({a,{r,c}});
	}
	FOR(i,0,N){
		auto X = pq.top();
		int h = X.second.first;
		int w = X.second.second;
		int a = X.first;
		pq.pop();
		if(not uf.same(h,w+H)){
			ans += a;
			uf.unite(h,w+H);
		}else if(not uf.same(h,H+W+2)){
			ans += a;
			uf.unite(h,H+W+2);
		}
	}
	cout << ans << endl;
}
