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

int main() {
  auto get_ints = []() {
    vector<int> res;
    string buf;
    getline(cin, buf);
    stringstream ss(buf);
    for (string s; ss >> s; ) {
      res.push_back(stoi(s));
    }
    return res;
  };

  int N = get_ints()[0];
  assert(N == 3);

  vector<int> r1 = get_ints();
  if (r1.size() == 3) {
    cout << "\"assert\"" << endl;
  } else {
    r1.push_back(get_ints()[0]);
    r1.push_back(get_ints()[0]);
    vector<int> sums;
    for (int i = 0; i < N; ++i) {
      for (int j = i + 1; j < N; ++j) {
        sums.push_back(r1[i] + r1[j]);
      }
    }
    sort(sums.begin(), sums.end(), [](int x, int y) { return x > y; });
    cout << sums[1] << endl;
  }
  
  return 0;
}