#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(NULL);
  long long int n, k, i, var, sum, counter, l;
  vector<long long int> v, vec;
  cin >> n >> k;
  for (i = 0; i < n; i++) {
    cin >> var;
    v.push_back(var);
  }
  sum = 0, counter = 0;
  for (i = 0; i < n; i++) {
    if ((sum - ((n - (i + 1)) * v[i] * counter)) < k) {
      vec.push_back(i + 1);
    } else {
      counter++;
      sum = sum + v[i] * (counter - 1);
    }
  }
  l = vec.size();
  for (i = 0; i < l; i++) cout << vec[i] << "\n";
  return 0;
}
