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