#include <bits/stdc++.h>
using namespace std;
int n, a[101];
int main() {
  cin >> 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++)
      if (j != i)
        for (int k = 0; k < n; k++)
          if (i != k && j != k && a[i] == a[j] + a[k]) {
            cout << i + 1 << " " << j + 1 << " " << k + 1 << endl;
            return 0;
          }
  cout << "-1" << endl;
  return 0;
}
