#include <bits/stdc++.h>
using namespace std;
long long n, k, t = 0, a, e = 0;
int main() {
  cin >> n >> k;
  for (long long i = 1; i <= n; i++) {
    cin >> a;
    if (i > 1 && t - (n - i) * a * (i - e - 1) < k) {
      cout << i << "\n";
      e++;
    } else
      t += a * (i - 1 - e);
  }
}
