#include <bits/stdc++.h>
using namespace std;
long long int n, k, x, numbers, sum;
int main() {
  scanf("%I64d %I64d", &n, &k);
  for (int i = 1; i <= n; i++) {
    scanf("%I64d", &x);
    if (sum - (numbers * (n - i) * x) < k)
      printf("%d\n", i);
    else
      sum += (numbers * x), numbers++;
  }
  return 0;
}
