#include <bits/stdc++.h>
typedef long long ll;
typedef long l;
using namespace std;
int main()
{
  bool ck = false;
  int T;
  int a,b,c,m = 0,n = 0,o = 0;
  cin >> T;
  for(int i = 1; i <= T; i++){
    cin >> a >> b;
    if(a > 0 || a < 0){
        n++;
    }
    if(b > 0 || b < 0){
        m++;
    }
  }
  if(n == T && (m == T || m == 0)){
    cout << "YES" << endl;
  }
  else if(m == T && (n == T || n == 0))
  {
      cout << "YES" << endl;
  }
  else{
    cout << "NO" << endl;
  }
    return 0;
}