//時間計測用
//構築未実装
#include <iostream>
#include <stdio.h>
#include <vector>
#include <algorithm>
#include <assert.h>
#include <stdlib.h>
#include <memory.h>
#include <queue>
#include <time.h>
#include <chrono>
#include <sys/time.h>
using namespace std;
#define ll long long
#define INF 1000000000000000000
using std::cout; using std::endl;
using std::chrono::duration_cast;
using std::chrono::milliseconds;
using std::chrono::seconds;
using std::chrono::system_clock;

ostream& operator<<(ostream& os,queue<ll> a){
  while(!a.empty()){
    ll t=a.front();
    a.pop();
    os<<t<<" ";
  }
  return os;
}

ll my_min(ll x,ll y){
  if(x>y)return y;
  return x;
}

struct edge3{
  ll to,cap,rev;
};

ostream& operator<<(ostream& os,edge3& a){
  return os<<a.to<<" "<<a.cap<<" "<<a.rev;
}

ostream& operator<<(ostream& os,vector<edge3>& a){
  for(edge3 i:a){
    os<<i<<"\n";
  }
  return os;
}

//typedef struct Dinic{
  //const ll INF=1000000000000000000;
  const ll MAX_V=200010;
  /*
  vector<edge3>* G;
  ll* level;
  ll* iter;
  */
  vector<edge3> G[200010];
  ll level[200010];
  ll iter[200010];
  //Dinic(){}
  /*
  Dinic(ll max_v){
    MAX_V = max_v;
    G=new vector<edge3>[MAX_V];
    level=new ll[MAX_V];
    iter=new ll[MAX_V];
  }
  */
  void add_edge(ll from,ll to,ll cap){
    G[from].push_back((edge3){to,cap,(ll)G[to].size()});
    G[to].push_back((edge3){from,0,(ll)G[from].size()-1});
  }
  void bfs(ll s){
    memset(level,-1,sizeof(level));
    queue<ll> que;
    level[s]=0;
    que.push(s);
    while(!que.empty()){
      //cout<<que<<endl;
      ll v=que.front();que.pop();
      //cout<<"v"<<v<<endl;
      //cout<<G[v]<<endl;
      for(ll i=0;i<(ll)G[v].size();i++){
        edge3 &e=G[v][i];
        if(e.cap>0 && level[e.to]<0){
          level[e.to]=level[v]+1;
          que.push(e.to);
        }
      }
    }
  }
  ll dfs(ll v,ll t,ll f){
    if(v==t)return f;
    //cout<<"&i:"<<iter[v]<<" "<<G[v].size()<<endl;
    for(ll &i=iter[v];i<(ll)G[v].size();i++){
      edge3 &e=G[v][i];
      //cout<<e.cap<<" "<<level[v]<<" "<<level[e.to]<<endl;
      if(e.cap>0 && level[v]<level[e.to]){
        ll d=dfs(e.to,t,my_min(f,e.cap));
        //cout<<"d:"<<d<<endl;
        if(d>0){
          e.cap-=d;
          G[e.to][e.rev].cap+=d;
          return d;
        }
      }
    }
    return 0;
  }
  ll max_flow(ll s,ll t){
    ll flow=0;
    for(;;){
      bfs(s);
      //cout<<"bfs end\n";
      if(level[t]<0)return flow;
      //cout<<level[t]<<endl;
      memset(iter,0,sizeof(iter));
      ll f;
      while((f=dfs(s,t,INF))>0){
        //cout<<f<<endl;
        flow+=f;
      }
      //cout<<f<<endl;
    }
  }
//};


int main(){
  auto start = duration_cast<milliseconds>(system_clock::now().time_since_epoch()).count();
  ll N,A,B;
  cin>>N;
  //Dinic F(200002);
  //Dinic F;
  //cout<<"INF:"<<F.INF<<endl;
  for(int i=0;i<N;i++){
    //cerr<<i<<endl;
    cin>>A>>B;
    A--;B--;
    /*
    F.add_edge(200000,i,1);
    F.add_edge(i,100000+A,1);
    if(A!=B)F.add_edge(i,100000+B,1);
    F.add_edge(100000+i,200001,1);
    */
    add_edge(200000,i,1);
    add_edge(i,100000+A,1);
    if(A!=B)add_edge(i,100000+B,1);
    add_edge(100000+i,200001,1);
  }
  //cerr<<"edge added\n";
  //ll cnt=F.max_flow(200000,200001);
  ll cnt=max_flow(200000,200001);
  //cout<<cnt<<endl;
  if(cnt!=N){
    cout<<"No\n";
    return 0;
  }
  //ここから構築
  cout<<"Yes\n";
  auto end= duration_cast<milliseconds>(system_clock::now().time_since_epoch()).count();
  cerr<<end-start<<endl;
  return 0;
}