#include <bits/stdc++.h>
class Solver {
 public:
  Solver() = default;
  void read() {
    int n;
    std::cin >> n;
    int left = 0;
    int right = 0;
    for (int i = 0; i < n; ++i) {
      int x, y;
      std::cin >> x >> y;
      if (x < 0)
        left++;
      else
        right++;
    }
    if (left <= 1 || right <= 1)
      std::cout << "Yes\n";
    else
      std::cout << "No\n";
  }
  void solve() {}
  void write() {}
};
int main() {
  Solver solver;
  solver.read();
  solver.solve();
  solver.write();
  return 0;
}
