#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 {
    int s = r1[0];
    s += get_ints()[0];
    s += get_ints()[0];
    cout << s << endl;
  }
  
  return 0;
}