#include <bits/stdc++.h>
using namespace std;
void solve() {
  int n, x, y, c1 = 0, c2 = 0, m;
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> x >> y;
    if (x > 0)
      c1++;
    else
      c2++;
  }
  m = min(c1, c2);
  if (m <= 1)
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
}
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  { solve(); }
  return 0;
}
