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