#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 (a[i] + a[j] == a[k] and i != j and i != k and j != k) {
          cout << k + 1 << ' ' << i + 1 << ' ' << j + 1;
          return 0;
        }
      }
    }
  }
  cout << -1;
}
