#include <bits/stdc++.h>
using namespace std;
int a[222222];
int main() {
  int n, k;
  scanf("%d%d", &n, &k);
  for (int i = 0; i < n; i++) scanf("%d", &a[i]);
  int kt = 1, cn = n;
  long long ps = 0;
  for (int i = 1; i < n; i++) {
    if (ps - 1LL * kt * (cn - kt - 1) * a[i] < k) {
      cn--;
      cout << i + 1 << "\n";
    } else {
      ps += 1LL * kt * a[i];
      kt++;
    }
  }
  return 0;
}
