#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int n, k;
  cin >> n >> k;
  vector<long long int> ans;
  long long int sum = 0;
  long long int a[n + 1];
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
  }
  long long int cnt = 0;
  long long int tot = n;
  for (int i = 1; i <= n; i++) {
    if ((sum - a[i] * (tot - i) * cnt) < k) {
      ans.push_back(i);
    } else {
      sum = sum + a[i] * cnt;
      cnt++;
    }
  }
  for (int i = 0; i < ans.size(); i++) cout << ans[i] << "\n";
}
