#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int mas[1001];
  for (int i = 0; i < n; i++) cin >> mas[i];
  for (int i = 0; i < n; i++)
    for (int j = 0; j < n; j++)
      for (int k = 0; k < n; k++)
        if (j != k)
          if (mas[i] == mas[j] + mas[k]) {
            cout << i + 1 << ' ' << j + 1 << ' ' << k + 1;
            return 0;
          }
  cout << "-1";
  return 0;
}
