//
// Created by yamunaku on 2019/07/26.
//

#include <bits/stdc++.h>

using namespace std;

#define rep(i, n) for(int i = 0; i < (n); i++)
#define repl(i, l, r) for(int i = (l); i < (r); i++)
#define per(i, n) for(int i = ((n)-1); i >= 0; i--)
#define perl(i, l, r) for(int i = ((r)-1); i >= (l); i--)
#define all(x) (x).begin(),(x).end()
#define MOD9 998244353
#define MOD1 1000000007
#define IINF 1000000000
#define LINF 1000000000000000000
#define SP <<" "<<
#define CYES cout<<"Yes"<<endl
#define CNO cout<<"No"<<endl
#define CFS cin.tie(0);ios::sync_with_stdio(false)
#define CST(x) cout<<fixed<<setprecision(x)

typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<vector<int>> mti;
typedef vector<ll> vl;
typedef vector<vector<ll>> mtl;

int main(){
    string s;
    getline(cin,s);
    int n=stoi(s);
    getline(cin,s);
    rep(i,s.size()) if(s[i]==' '){
        cout << "\"assert\"" << endl;
        return 0;
    }
    ll a=stoll(s),b,c;
    cin >> b >> c;
    set<ll> st;
    st.insert(a+b);
    st.insert(b+c);
    st.insert(c+a);
    auto itr=st.begin();
    if(st.size()==3) itr++;
    cout << (*itr) << endl;
    return 0;
}