#include <bits/stdc++.h>
using namespace std;
int main() {
  long long n, k;
  cin >> n >> k;
  long long a, i, j, d, c = 0;
  vector<long long> vec;
  cin >> a;
  vec.push_back(a);
  for (i = 2; i <= n; i++) {
    cin >> a;
    d = 0;
    for (j = 1; j <= vec.size(); j++) {
      d += (vec[j - 1] * (j - 1) - (n - (vec.size() + 1 + c)) * a);
    }
    if (d < k) {
      cout << i << endl;
      c++;
    } else {
      vec.push_back(a);
    }
  }
  return 0;
}
