#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
signed main() { 
  ios::sync_with_stdio(false); cin.tie(0);
  int n;
  cin >> n;
  long long a[3];
  string s;
  cin.ignore();
  getline(cin, s);
  for (char c : s) {
    if (c == ' ') {
      cout << '"' << "assert" << '"' << endl;
      return 0;
    }
  }
  //cerr << s << endl;
  a[0] = stol(s);
  cin >> a[1] >> a[2];
  vector<long long> sums = {a[0] + a[1], a[1] + a[2], a[0] + a[2]};
  sort(sums.begin(), sums.end());
  sums.erase(unique(sums.begin(), sums.end()), sums.end());
  sort(sums.rbegin(), sums.rend());
  cout << sums[1] << endl;
  return 0;
}