#include <bits/stdc++.h>
using namespace std;
long long a[200005];
int main() {
  long long k, sum, subs, di;
  int i, n, rel;
  cin >> n >> k;
  int n1 = n;
  for (i = 1; i <= n; i++) cin >> a[i];
  i = 1;
  sum = 0;
  rel = 1;
  while (1) {
    if (i > n1) break;
    subs = (n - rel) * a[i] * (rel - 1);
    di = sum - subs;
    if (di < k) {
      n--;
      rel--;
      printf("%d\n", i);
    } else {
      sum = sum + a[i] * (rel - 1);
    }
    i++;
    rel++;
  }
  return 0;
}
