#include<bits/stdc++.h>
using namespace std;

#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define ALL(v) v.begin(),v.end()
typedef long long ll;
template <class T> using V=vector<T>;
template <class T> using VV=V<V<T>>;
 
int main(){
  ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  
  ll n;
  cin>>n;
  V<ll> A(n);
  ll sum=0;
  rep(i,n){
    cin>>A[i];
    sum+=A[i];
  }
  sort(ALL(A));
  if(A[0]*(sum-A[0])<=0) cout<<"Yes"<<endl;
  else if(A[n-1]*(sum-A[n-1])<=0) cout<<"Yes"<<endl;
  else cout<<"No"<<endl;
    
  return 0;
}