#include <bits/stdc++.h>
using namespace std;
long long n, m;
long long k;
string s;
long long t = 0;
long long a, b, cur;
long long d;
int main() {
  cin >> n >> k;
  for (long long i = 1; i <= n; ++i) {
    long long t;
    cin >> t;
    long long p = a - t * cur * (n - b - cur - 1);
    if (p < k) {
      cout << i << endl;
      b++;
    } else {
      cur++;
      a += (cur - 1) * t;
    }
  }
  return 0;
}
