seq c++

#include<bits/stdc++.h>
using namespace std;
#define ll long long

int n,a[100000];

ll s=0;

void nhap()
{
    cin>>n;
    for(int i=1;i<=n;i++)
        cin>>a[i];
}

void giai()
{
    for(int i=1;i<=n;i++) s=s+a[i];
    for(int i=1;i<=n;i++)
    {
        if(s-a[i]==a[i])
        {
            cout<<a[i];
            return;
        }
    }
    cout<<"N";

}
int main()
{
   // freopen("b.inp","r",stdin);
  //  freopen("b.out","w",stdout);
    nhap();
    giai();
}