#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 && j != k && i != k && a[i] == a[j] + a[k]) {
          cout << i + 1 << " " << j + 1 << " " << k + 1;
          exit(0);
        }
      }
    }
  }
  cout << -1;
}
