#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < n; i++)
#define all(a) a.begin(),a.end()
#define SORT(a) sort(all(a));
#define MIN(a) *min_element(all(a))
#define MAX(a) *max_element(all(a))
#define SUM(a) accumulate(all(a),0LL)
using ll=long long;
using ld=long double;
using ull=unsigned long;
ll MOD=998244353;
ll inf=1e15;
using mint = static_modint<998244353>;
int main(){
  cin.tie(nullptr);
  cout.tie(nullptr);
  ios::sync_with_stdio(false);
  ll n;cin>>n;
  vector<ll>a(n);
  ll sum=0;
  ll min1=inf;
  ll max1=-inf;
  rep(i,n){
  	cin>>a[i];
	sum+=a[i];
	min1=min(min1,a[i]);
	max1=max(max1,a[i]);
  }
  if(sum<=0){
  	if(sum>=min1){cout<<"Yes"<<endl;}
  	else{cout<<"No"<<endl;}
  }
  else{
  		if(sum<=max1){cout<<"Yes"<<endl;}
  		else{cout<<"No"<<endl;}
  	}
}