!/bin/python3

import math import os import random import re import sys

#

Complete the 'cookies' function below.

#

The function is expected to return an INTEGER.

The function accepts following parameters:

1. INTEGER k

2. INTEGER_ARRAY A

#

def insert(A,k): A.append(k) i=len(A)-1 while i>0: if A[i]

def heapify(A,n,i): left=2*i+1 right=2*i+2 smallest=i if (leftA[left]): smallest=left if(rightA[right]): smallest =right if smallest!=i: A[i],A[smallest]=A[smallest],A[i] heapify(A,n,smallest)

def heapi(A): i=(len(A)+1)//2 while(i>=0): heapify(A,len(A),i) i-=1 return A

def cookies(k, A): # Write your code here heapi(A) count=0 j=0 m=len(A) while(len(A)!=1 and j j+=1

if A[0]<k:
    return -1
return count

if name == 'main': fptr = open(os.environ['OUTPUT_PATH'], 'w')

first_multiple_input = input().rstrip().split()

n = int(first_multiple_input[0])

k = int(first_multiple_input[1])

A = list(map(int, input().rstrip().split()))

result = cookies(k, A)

fptr.write(str(result) + '\n')

fptr.close()