#include <bits/stdc++.h>
using namespace std;
int n;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cin >> n;
  int sl = 0;
  for (int i = 1; i <= n; ++i) {
    int x, y;
    cin >> x >> y;
    if (x > 0) ++sl;
  }
  if (sl == n || sl == 0 || sl == n - 1 || sl == 1) {
    cout << "Yes";
    return 0;
  }
  cout << "No";
}
