#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, x, y, z;
  cin >> n;
  int arr[n];
  for (int i = 0; i < n; i++) {
    cin >> arr[i];
  }
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < n; j++) {
      for (int k = 0; k < n; k++) {
        if (arr[i] == arr[j] + arr[k] && k != j) {
          cout << i + 1 << " " << j + 1 << " " << k + 1 << endl;
          return 0;
        }
      }
    }
  }
  cout << -1 << endl;
  return 0;
}
