#include<iostream>
#include<vector>
#include<algorithm>

using namespace std;
using ll = long long;

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    ll n;
    cin>>n;
    vector<ll> a(n);
    for(int i = 0;i<n;i++) cin>>a[i];
    ll sum = 0;
    for(int i = 0;i<n;i++) {
        if(a[i]==1||a[i]==0){
            cout<<"Yes\n";
            return 0;
        }
        sum += a[i];
    }
    if(sum==0) cout<<"Yes\n";
    else cout<<"No\n";
}