#include <stdio.h>
#include<iostream>
#include <cmath>

using namespace std;

int main() {
	int n;
	bool ans = true;
	cin >> n;
	int S[11][2];
	double egim,curr;
	cin >> S[0][0] >> S[0][1];
	for (int i = 1; i < n; i++) {
		cin >> S[i][0] >> S[i][1];
		if (i != 1) {
			egim = double(S[i][1] - S[0][1]) / double(S[i][0] - S[0][0]);
			if (abs(curr)!= abs(egim)) {
				ans = false;
			}
		}
		else {
			curr = double(S[i][1] - S[0][1]) / double(S[i][0] - S[0][0]);
		}
	}
	if (n > 2) {
		if (ans)
			cout << "YES";
		else
			cout << "NO";
	}
	else {
		if (S[0][0] == S[1][0] || S[0][1] == S[1][1]) {
			cout << "YES";
		}
		else {
			cout << "NO";
		}
	}
	
	return 0;
}