#include<bits/stdc++.h>
using namespace std;
#define int long long
#define endl "\n"
#define ff first
#define ss second
#define pb push_back
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define f(i,x,y) for(int i=x;i<y;i++)
#define f2(i,x,y) for(int i=x;i>=y;i--)
#define pii pair<int,int>
#define Fast ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
const int MOD =1000000007;
const int INF = 1e18;
const int N = 2e5;
 
void solve(int tc){
    map<int,int>mp;
    int n; cin >> n;
    for(int i=0;i<n;i++){
        int x; cin >> x;
        mp[x]++;
    }
    for(auto it : mp){
        if(it.ss % 2){
            cout << it.ff << endl;
            return;
        }
    }
}
int32_t main(){

    Fast

    int t=1;

    //cin >> t;

    for(int tc=1;tc<=t;tc++){

        solve(tc);
    }
    return 0;
}