#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, k;
  cin >> n >> k;
  list<long long> ary;
  for (int i = 0; i < n; i++) {
    int a;
    cin >> a;
    ary.push_back(a);
  }
  long long difst = 0;
  bool flg = false;
  auto it = ary.begin();
  int j = 0;
  int m = n;
  for (int i = 0; i < n; i++) {
    long long d = difst - j * (m - j - 1) * (*it);
    if (d >= k) {
      difst += (*it) * j;
      j++;
    } else {
      cout << i + 1 << endl;
      m--;
    }
    it++;
  }
  return 0;
}
