#include <bits/stdc++.h>
using namespace std;
long long dp, n, a, k;
int main() {
  ios::sync_with_stdio(false);
  cin >> n >> k;
  for (long long i = 1, cnt = 1, m = n; i <= n; i++) {
    cin >> a;
    if (dp - (cnt - 1) * (m - cnt) * a < k) {
      cout << i << '\n';
      m--;
    } else {
      dp += a * (cnt - 1);
      cnt++;
    }
  }
  return 0;
}
