#include <cstdio>
#include <cstring>
#include <iostream>
#include <string>
#include <cmath>
#include <bitset>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <algorithm>
#include <complex>
#include <unordered_map>
#include <unordered_set>
#include <random>
#include <cassert>
#include <fstream>
#include <utility>
#include <functional>
#include <time.h>
#include <stack>
#include <array>
#include <list>
#include <atcoder/all>
#define popcount __builtin_popcount
using namespace std;
using namespace atcoder;
typedef long long ll;
typedef pair<int, int> P;

int main()
{
    int n;cin>>n;
    vector<P> p(n);
    for(int i=0; i<n; i++){
        cin>>p[i].first>>p[i].second;
    }
    sort(p.begin(), p.end());
    if(p[0].first==1) cout<<"Yes"<<endl;
    else cout<<"No"<<endl;
    return 0;
}