#include <bits/stdc++.h>
using namespace std;
#define int long long
#define FOR(i, s, n) for (int i = (s); i < (n); i++)
#define RFOR(i, s, n) for (int i = (n) - 1; i >= (s); i--)
#define REP(i, n) FOR(i, 0, n)
#define RREP(i, n) RFOR(i, 0, n)
#define ALL(a) a.begin(), a.end()
const long long MOD = 1e9+7, INF = 1e18;
template<class T>inline bool CHMAX(T&a,T b){if(a<b){a=b;return true;}return false;}
template<class T>inline bool CHMIN(T&a,T b){if(a>b){a=b;return true;}return false;}



signed main(){
	int N;
	cin >> N;
	cin.ignore();
	string s;
	getline(cin,s);
	int flg = 0;
	REP(i,s.size())if(s[i] == ' ')flg = 1;
	if(flg){
		cout<<"\"assert\""<<endl;
		return 0;
	}
	vector<int>a(3);
	a[0] = stoll(s);
	cin >> a[1] >> a[2];
	set<int>st;
	REP(i,3)FOR(j,i+1,3)st.insert(a[i]+a[j]);
	vector<int>v(ALL(st));
	cout<<v[v.size()-2]<<endl;
}