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