#include <bits/stdc++.h>
using namespace std;
vector<long long int> v;
int main() {
  long long int a[200005], n, k, t;
  cin >> n >> k;
  v.push_back(0);
  for (long long int i = 1; i <= n; i++) {
    cin >> t;
    v.push_back(t);
  }
  long long int sum = 0, f = 0;
  for (long long int i = 1, j = 0; i <= n; i++) {
    if (sum - j * (n - i) * v[i] < k) {
      cout << i << endl;
    } else {
      sum += v[i] * j;
      j++;
    }
  }
  return 0;
}
