#include <bits/stdc++.h>
using namespace std;
long long k, a[211111], sum, res;
string s;
int main() {
  long long n, k, i;
  cin >> n >> k;
  for (i = 1; i <= n; i++) cin >> a[i];
  int t = 0, m = n, d = 1;
  for (i = 2; i <= n; i++) {
    long long tp = t - d * (m - (d + 1)) * a[i];
    if (tp < k) {
      cout << i << endl;
      m--;
    } else {
      d++;
      t += a[i] * (d - 1);
    }
  }
}
