#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, k;
  while (cin >> n >> k) {
    long long s = 0, e = 0, x;
    for (int i = 1; i <= n; ++i) {
      cin >> x;
      if (s - x * (n - i) * (i - e - 1) < k)
        cout << i << endl, e++;
      else
        s += x * (i - e - 1);
    }
  }
  return 0;
}
