#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int *arr = new int[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++) {
      if (j == i) continue;
      for (int k = 0; k < n; k++) {
        if (k == i || k == j) continue;
        if (arr[i] == arr[j] + arr[k]) {
          cout << i + 1 << " " << j + 1 << " " << k + 1 << endl;
          return 0;
        }
      }
    }
  cout << -1;
  return 0;
}
