#include<iostream>
using namespace std;
int a[210010],ma=-1e9,mi=1e9;
int main(){
    int n; cin>>n;
    int sum1=0,sum2=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]);
    }
    if(mi > 0 || ma < 0){
        cout <<"No"<< endl;
        return 0;
    } 
    if(sum1 > 0){
        if(sum1<=abs(mi)){
            cout<<"Yes"<<endl;
        } else {
            cout<<"No"<<endl;
        }
    }
    if(sum2 > 0){
        if(sum2 <= ma){
            cout<<"Yes"<<endl;
        } else {
            cout<<"Yes"<<endl;
        }
    }
    return 0;
}