#include <bits/stdc++.h>
using namespace std;
using ll = long long int;
int main(){
    ll N;
    cin >> N;
    for(ll i = 0;i < N;i++){
        ll a,b;
        cin >> a >> b;
        if(b == 1){
            cout << "Yes" << endl;
            return 0;
        }
    }
    cout << "No" << endl;
}