#include <bits/stdc++.h>
using namespace std;
int arr[200005];
int main() {
  int n, k;
  scanf("%d%d", &n, &k);
  for (int i = 1; i <= n; ++i) scanf("%d", &arr[i]);
  long long sum = 0;
  int in = 0, left = n;
  for (int i = 1; i <= n; ++i) {
    long long d = sum - 1LL * (left - 1 - in) * arr[i] * in;
    if (d < k) {
      printf("%d\n", i);
      --left;
    } else {
      sum += 1LL * in * arr[i];
      ++in;
    }
  }
  return 0;
}
