#include <bits/stdc++.h>
using namespace std;
const int N = 100500;
int main() {
  srand(time(NULL));
  ios_base::sync_with_stdio(0);
  int n;
  long long k;
  cin >> n >> k;
  long long sum = 0;
  long long sz = n;
  vector<int> ans;
  int pos = 1;
  for (int i = 1; i <= n; i++) {
    long long x;
    cin >> x;
    long long bal = sum - (sz - pos) * 1LL * (pos - 1) * x;
    if (bal < k) {
      ans.push_back(i), sz--;
    } else {
      sum += (pos - 1) * 1LL * x;
      pos++;
    }
  }
  for (auto i : ans) cout << i << "\n";
  return 0;
}
