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

typedef long long int ll;
#define CONTAINS(v, x) (find(v.begin(), v.end(), x) != v.end())

// ====================================================================

int main() {
  string s;
  getline(cin, s);
  vector<ll> v(3);
  for (int i = 0; i < 3; i++) {
    getline(cin, s, '\n');
    if (CONTAINS(s, ' ')) {
      cout << "\"assert\"" << endl;
      return 0;
    } else {
      v[i] = stoll(s);
    }
  }

  set<ll> ans;
  ans.insert(v[0] + v[1]);
  ans.insert(v[0] + v[2]);
  ans.insert(v[1] + v[2]);
  cout << *prev(ans.end(), 2) << endl;
}