#include <bits/stdc++.h>
using namespace std;
int n, a, b, i, p = 2e9;
int main() {
  for (cin >> n; i < n; i++) {
    cin >> a >> b;
    if (max(a, b) <= p)
      p = max(a, b);
    else if (a <= p)
      p = a;
    else if (b <= p)
      p = b;
    else
      return cout << "NO", 0;
  }
  cout << "YES";
}
