#include <bits/stdc++.h>
using namespace std;
#pragma comment(linker, "/STACK:64000000")
int n, k;
int x;
long long d;
int main() {
  scanf("%d%d", &n, &k);
  int cur = 0;
  d = 0;
  for (int i = 0; i < n; ++i) {
    scanf("%d", &x);
    long long dd = d - (long long)cur * (long long)(n - i - 1) * (long long)x;
    if (dd < k) {
      printf("%d\n", i + 1);
      continue;
    }
    d += (long long)cur * x;
    ++cur;
  }
  return 0;
}
