#include <bits/stdc++.h>
using namespace std;
long long rate[2000002];
int n, k;
int main() {
  cin >> n >> k;
  for (int i = 0; i < n; i++) cin >> rate[i];
  long long p = 0, c;
  int del = 0;
  vector<int> vec;
  for (int i = 1; i <= n; i++) {
    if (i - del > 1)
      c = (-rate[i - 1] * ((n - del) - (i - del))) * (i - del - 1) + p;
    else
      c = 0;
    if (c < k)
      del++, vec.push_back(i);
    else
      p += rate[i - 1] * (i - del - 1);
  }
  for (int i = 0; i < vec.size(); i++) cout << vec[i] << endl;
  return 0;
}
