#include<iostream>
#define int long long
using namespace std;
int a[210010],ma=-1e10,mi=1e10;
signed main(){
    int n; cin>>n;
    int sum1=0,sum2=0,sum=0;
    for(int i=1;i<=n;i++) {
        cin >> a[i];
        if(a[i]<=0) sum1+=abs(a[i]),sum2-=abs(a[i]);
        if(a[i]>=0) sum1-=a[i],sum2+=a[i];
        ma=max(ma,a[i]);
        mi=min(mi,a[i]);
        sum+=a[i];
    }
    if(sum==0){
        cout<<"Yes"<<endl;
        return 0;
    }
    if(sum>0){
        if(sum2>ma)cout<<"No"<<endl;
        else cout<<"Yes"<<endl;
    } else{
        if(sum1>abs(mi))cout<<"No"<<endl;
        else cout<<"Yes"<<endl;
    }
    return 0;
}