#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define yes cout << "YES" << "\n";
#define no cout << "NO" << "\n";
#define fri(a,b) for(ll i = a; i<b; i++) 
#define frj(a,b) for(ll j = a; j <b; j++)
#define frk(a,b) for(ll k = a; k <b; k++) 
#define rfri(a,b) for(ll i = a; i>=b; i--)

using namespace std;
int main()
{
    ios_base:: sync_with_stdio(false);
    cin.tie(NULL);

    ll T = 1;
    // cin >> T;
    while(T--)
    {
     ll x,y,n;
     cin >> n;
     cin >> x >> y;
     bool ps = 0;
     while(n--)
     {
        ll x1,y1;
        cin >> x1 >> y1;
        if(((x1>=0 && x>=0)||(x1<=0 && x<=0)) && ((y1>=0 && y>=0)||(y1<=0 && y<=0)))
        {
            if((abs(x1)<=abs(x)) && (abs(y1)<=abs(y))) ps  = 1;
        }
     }
     if(ps) yes
     else no
    }
}