#include <bits/stdc++.h>
using namespace std;
long long power(long long x, long long y) {
  long long res = 1LL;
  x = x % 1000000007;
  while (y > 0) {
    if (y & 1) res = (res * x) % 1000000007;
    y = y >> 1;
    x = (x * x) % 1000000007;
  }
  return res % 1000000007;
}
long long inv(long long n) { return power(n, 1000000007 - 2) % 1000000007; }
long long n, p, x, y;
void solve() {
  long long m;
  cin >> m;
  while (m--) {
    cin >> x >> y;
    if (x < 0)
      n++;
    else
      p++;
  }
  if (n <= 1 || p <= 1)
    cout << "YES\n";
  else
    cout << "NO\n";
}
int32_t main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  long long t = 1;
  while (t--) {
    solve();
  }
}
