#include <bits/stdc++.h>
#pragma warning(disable : 4996)
using namespace std;
const double pi = acos(-1.0);
const double eps = 1e-11;
const int inf = 0x3f3f3f3f;
template <class T>
void show(T a, int n) {
  for (int i = 0; i < n; ++i) cout << a[i] << ' ';
  cout << endl;
}
template <class T>
void show(T a, int r, int l) {
  for (int i = 0; i < r; ++i) show(a[i], l);
  cout << endl;
}
const int N = 3e5 + 111;
int a[N];
int main() {
  int n, k, i, j;
  cin >> n >> k;
  for (i = 1; i <= n; i++) scanf("%d", a + i);
  long long x = 0;
  long long y = 0;
  int z = 0;
  for (i = 2; i <= n; i++) {
    y = -(long long)(n - i) * (long long)a[i] * (long long)(i - z - 1);
    if (x + y < k) {
      printf("%d\n", i);
      z++;
    } else {
      x += (long long)(i - 1 - z) * (long long)a[i];
    }
  }
  return 0;
}
