#include <bits/stdc++.h>
using namespace std;
long long sum[200005];
long long ans[200005];
long long a[200005];
long long alive[200005];
long long n, k, cnt = 0;
signed main() {
  scanf("%lld%lld", &n, &k);
  for (long long i = 1; i <= n; i++) scanf("%lld", &a[i]);
  for (long long i = 1; i <= n; i++) {
    ans[i] = sum[cnt] - a[i] * (n - i) * (cnt);
    if (ans[i] < k)
      printf("%lld\n", i);
    else
      alive[++cnt] = a[i], sum[cnt] = sum[cnt - 1] + (cnt - 1) * alive[cnt];
  }
}
