#include <bits/stdc++.h>
//#include <atcoder/all>
//using namespace atcoder;
using namespace std;
using ll = long long;
using vll = vector<ll>;
using vvll = vector<vll>;
using vvvll = vector<vvll>;
using vb = vector<bool>;
using vvb = vector<vb>;
using vvvb = vector<vvb>;
#define all(A) A.begin(),A.end()
#define rep(i, n) for (ll i = 0; i < (ll) (n); i++)
using pqr = priority_queue<pair<ll, ll>, vector<pair<ll, ll>>, greater<pair<ll, ll>>>;

template<class T>
bool chmax(T& p, T q) {
    if (p < q) {
        p = q;
        return 1;
    }
    else {
        return 0;
    }
}
template<class T>
bool chmin(T& p, T q) {
    if (p > q) {
        p = q;
        return 1;
    }
    else {
        return 0;
    }
}
ll gcd(ll(a), ll(b)) {
    ll c = a;
    while (a % b != 0) {
        c = a % b;
        a = b;
        b = c;
    }
    return b;
}
ll Eugrid(ll A, ll B, ll& x, ll& y) {
    if (B == 0) {
        x = 1;
        y = 0;
        return A;
    }
    ll C = gcd(A, B);
    ll D = Eugrid(B, A % B, y, x);
    y -= A / B * x;
    return D;
}//Ax+By=gcd(A,B)の解

ll W,H;
ll N;

vector<pair<ll,ll>> P;

ll dfs(ll L,ll R,ll D,ll U){
    ll res=0;
    rep(p,N){
        ll X=P[p].first;
        ll Y=P[p].second;
        ll k=0;
        if(L<=X&&X<=R&&D<=Y&&Y<=U){
            k+=(R-L)+(D-U)-1;
            k+=dfs(L,X-1,D,Y-1);
            k+=dfs(L,X-1,Y+1,U);
            k+=dfs(X+1,R,D,Y-1);
            k+=dfs(X+1,R,Y+1,U);
        }
        chmax(res,k);
    }
    return res;
}

ll mod=1e9+7;
ll modPow(long long a, long long n, long long p=mod) {
  if(a==0)return 0;
  if (n == 0) return 1; // 0乗にも対応する場合
  if (n == 1) return a % p;
  if (n % 2 == 1) return (a * modPow(a, n - 1, p)) % p;
  long long t = modPow(a, n / 2, p);
  return (t * t) % p;
}



int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    
    ll N;
    cin>>N;
    bool OK=0;
    rep(i,N){
        ll U,W;
        cin>>U>>W;
        OK=(OK|(W==1));
    }
    cout<<(OK?"Yes":"No")<<endl;
}