#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;
    int x0;
    int y0;
    cin >> x0 >> y0;
    bool liex = true;
    bool liey = true;
    for(int a0 = 0; a0 < n - 1; a0++){
        int x;
        int y;
        cin >> x >> y;
        liex = liex && (!(x0 - x));
        liey = liey && (!(y0 - y));
    }
    cout << ((liex || liey)?"YES":"NO") << endl;
    return 0;
}