#include <bits/stdc++.h>
#define FOR(i,k,n)  for(int i = (k);i < (n);++i)
#define REP(i,n)    FOR(i,0,n)
#define ALL(x)      begin(x),end(x)

using namespace std;
using vecint = vector<int>;
using ll = int64_t;

int main()
{
  int n;
  cin>>n;
  string line;
  getline(cin, line);
  getline(cin, line);
  if (count(ALL(line), ' ')) {
    cout<<"\"assert\""<<endl;
    return 0;
  }
  ll a0 = stol(line);
  ll a1, a2;
  cin>>a1>>a2;
  set<ll> s;
  s.insert(a0+a1);
  s.insert(a1+a2);
  s.insert(a2+a0);
  s.erase(prev(end(s)));
  cout<<*prev(end(s))<<endl;
  return 0;
}