#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, k, i, a, cnt = 0;
  long long s = 0;
  scanf("%d%d", &n, &k);
  for (i = 1; i <= n; i++) {
    scanf("%d", &a);
    if (s - (long long)(n - i) * (i - cnt - 1) * a < k) {
      printf("%d\n", i);
      cnt++;
    } else
      s += (long long)(i - cnt - 1) * a;
  }
  return 0;
}
