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