#include <bits/stdc++.h>
using namespace std;
const int N = 2e5 + 10;
long long int aa[N];
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  long long int n, k;
  cin >> n >> k;
  for (int i = 1; i <= n; i++) cin >> aa[i];
  int realN = n;
  long long int delta = 0;
  long long int left = 0;
  for (int i = 1; i <= n; i++) {
    long long int dell = (realN - (left + 1)) * aa[i];
    if (delta - left * dell < k) {
      realN--;
      cout << i << "\n";
    } else {
      delta += left * aa[i];
      left++;
    }
  }
  return 0;
}
