#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <string>
#include <bitset>
#include <cstdio>
#include <limits>
#include <vector>
#include <climits>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <numeric>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <unordered_map>

using namespace std;


int main(){
    int n;
    cin >> n;
    vector<int>X;
    vector<int>Y;
    for(int a0 = 0; a0 < n; a0++){
        int x;
        int y;
        cin >> x >> y;
        if (x==0){
            X.push_back(x);
        }
        if (y==0){
            Y.push_back(y);
        }
    }
    if (X.size()==n || Y.size()==n){
        cout<<"YES";
    }
    else{
        cout<<"NO";
    }
    return 0;
}