#include <bits/stdc++.h>
using namespace std;
const long double E = 1e-4;
const int MOD = 1e9 + 7;
const long long MAX = 1e5 + 1;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  ;
  int nn;
  long long k;
  cin >> nn >> k;
  int n = nn;
  long long ar[n];
  for (int i = 0; i < n; i++) cin >> ar[i];
  long long first = 0;
  for (int i = 1, j = 1; i <= n; i++, j++) {
    long long second = (i - 1) * ar[j - 1] * (n - i);
    long long res = first - second;
    if (res < k) {
      n--;
      i--;
      cout << j << "\n";
    } else {
      first += (long long)ar[j - 1] * (i - 1);
    }
  }
}
