balance

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ll long long
#define el '\n'
#define yes cout<<"YES"<<el
#define no cout<<"NO"<<el
#define f(i,a,b) for(ll i = a; i <= b; i++)
#define fr(i,a,b) for(ll i = a; i >= b; i--)
#define vi vector<int>
#define speed ios_base::sync_with_stdio(false); cin.tie(0), cout.tie(0)
#define pb push_back
#define all(x) x.begin(),x.end()
#define sz(x) ((int)(x).size())
#define test ll _x86_; cin>>_x86_; while(_x86_--)

void solve()
{
    int n, sum{0}; cin>>n;
    f(i,1,n){
        int x; cin>>x;
        sum += x;
    }
    if(sum) no; else yes;
}

int32_t main()
{
    speed;     // test

    solve();
}