#include <bits/stdc++.h>
using namespace std;
long long n;
int x[100005], y[100005], num_, num;
int main() {
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> x[i] >> y[i];
    if (x[i] > 0) {
      num++;
    } else {
      num_++;
    }
  }
  if (num == 1 || num_ == 1 || num == 0 || num_ == 0) {
    cout << "Yes" << endl;
    return 0;
  } else {
    cout << "No" << endl;
    return 0;
  }
  return 0;
}
