#include <bits/stdc++.h>
using namespace std;
 
int N;
int arr[17];
int sum[3]={};
int total=0;
bool check=false;
 
void solve(int d){
	if(d<0){
		if(sum[0]==sum[1] && sum[1]==sum[2]){
			check=true;
			return;
		}
	}
	for(int i=0;i<3;i++){
		if(sum[i]+arr[d]<=total){
			sum[i]+=arr[d];
			solve(d-1);
			sum[i]-=arr[d];
		}
	}
}
 
int main() {
	cin >> N;
	for(int i=0;i<N;i++){
		cin >> arr[i];
		total+=arr[i];
	}
	if(total%3!=0){
		cout << "NO" << '\n';
		return 0;
	}
	total/=3;
	sort(arr,arr+N);
	solve(N-1);
	if(check==true){
		cout << "YES" << '\n';
	}else{
		cout << "NO" << '\n';
	}
}

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