#include <bits/stdc++.h>
int main() {
  long long n, k;
  scanf("%lld %lld", &n, &k);
  long long total(0), count(0);
  for (long long p = 1; p <= n; p++) {
    long long x;
    scanf("%lld", &x);
    if (p > 1 && total - x * (n - p) * (p - count - 1) < k) {
      printf("%lld\n", p);
      ++count;
    } else {
      total += x * (p - 1 - count);
    }
  }
  return 0;
}
