#include <bits/stdc++.h>
using namespace std;
void display(vector<int> v1) {
  for (long long int i = 0; i < v1.size(); i++) {
    cout << v1[i] << " ";
  }
  cout << endl;
}
long long int dx[8] = {0, 1, 0, -1, 1, 1, -1, -1};
long long int dy[8] = {1, 0, -1, 0, 1, -1, 1, -1};
const int MAXN = (int)1e6;
long long int arr[MAXN];
long long int n, k;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cin >> n >> k;
  for (int i = 1; i <= n; i += 1) {
    cin >> arr[i];
  }
  long long int currsum = 0;
  long long int cntr = 1;
  long long int coolprime = n;
  for (int i = 1; i <= n; i += 1) {
    long long int tosubtract = ((coolprime - (cntr)) * arr[i]) * (cntr - 1);
    long long int temp = currsum;
    temp -= tosubtract;
    if (temp < k) {
      coolprime -= 1;
      cout << i << endl;
      continue;
    }
    currsum += (cntr - 1) * (arr[i]);
    cntr += 1;
  }
  return 0;
}
