#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main() {
  int N;
  cin >> N;
  vector<ll> A(3);
  string s;
  for (int i = 0; i < N; i++) {
    cin >> s;
    if (s.find(" ")) {
      cout << "assert\n";
      return 0;
    }
    A[i] = atoll(s.c_str());
  }
  sort(A.begin(), A.end());
  cout << A[0] + A[1] << "\n";
  return 0;
}