#include <iostream>
using namespace std;

int main() {
    int n;
    cin >> n;
    int x0, y0;
    cin >> x0 >> y0;
    int x1, y1;
    cin >> x1 >> y1;
    int dx = x1 - x0;
    int dy = y1 - y0;
    bool line = dx == 0 || dy == 0;
    for(int i = 2; i < n && line; i++) {
        int xi, yi;
        cin >> xi >> yi;
        if((yi - y0) * (x1 - x0) != (xi - x0) * (y1 - y0)) {
            line = false;
        }
    }
    cout << (line ? "YES" : "NO") << endl;
    return 0;
}