#include <bits/stdc++.h>
const int Mod = 1000000007;
const double eps = 1e-8;
const long long inf = 1e18;
const int inf1 = 1e9;
const int N = 100005;
using namespace std;
int main() {
  int n, k, delete_count;
  long long rating, rating_change, common_factor;
  vector<int> trash;
  scanf("%d%d", &n, &k);
  scanf("%I64d", &rating);
  delete_count = 0;
  common_factor = 0;
  for (int i = 2; i <= n; i++) {
    scanf("%I64d", &rating);
    rating_change = common_factor - (n - i) * rating * (i - delete_count - 1);
    if (rating_change < k) {
      trash.push_back(i);
      delete_count++;
    } else {
      common_factor += (i - delete_count - 1) * rating;
    }
  }
  for (int i = 0; i < delete_count; i++) {
    printf("%d\n", trash[i]);
  }
  return 0;
}
