#include <bits/stdc++.h>
using namespace std;
int val[200005];
long long mov[200005];
int n;
long long k;
int main() {
  scanf("%d", &n);
  cin >> k;
  for (int i = 1; i <= n; i++) scanf("%d", &val[i]);
  int cnt = 0;
  long long sum = 0;
  for (int i = 1; i <= n; i++) {
    long long skor;
    skor = sum;
    skor -= 1ll * (n - i) * val[i] * cnt;
    if (skor < k) {
      printf("%d\n", i);
    } else {
      cnt++;
      sum = sum + val[i] * (cnt - 1);
    }
  }
}
