#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, k, a;
  while (scanf("%d%d", &n, &k) != EOF) {
    long long index = 1;
    long long rest = 0;
    scanf("%d", &a);
    for (int i = 2; i <= n; ++i) {
      scanf("%d", &a);
      if (rest - index * (n - i) * a < k)
        printf("%d\n", i);
      else {
        rest += index * a;
        index++;
      }
    }
  }
  return 0;
}
