#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, ii = 1, nn;
  long long k;
  cin >> n >> k;
  nn = n;
  long long sum = 0, minus = 0;
  long long s;
  long long *a = new long long[n];
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  for (int j = 1; j < n; j++) {
    minus = (nn - ii - 1) * a[j] * (ii);
    s = a[j] * (ii);
    if (sum - minus < k) {
      cout << j + 1 << '\n';
      nn--;
    } else {
      sum += s;
      ii++;
    }
  }
  return 0;
}
