#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  int n;
  cin >> n;
  int cp = 0, cn = 0;
  for (int i = 0; i < n; ++i) {
    int x, y;
    cin >> x >> y;
    if (x > 0)
      ++cp;
    else
      ++cn;
  }
  if (cp == 1 || cn == 1 || cp == 0 || cn == 0)
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
  return 0;
}
