!/bin/python3

import math import os import random import re import sys import bisect #

Complete the 'pylons' function below.

#

The function is expected to return an INTEGER.

The function accepts following parameters:

1. INTEGER k

2. INTEGER_ARRAY arr

#

def pylons(k, arr): n=len(arr) List=[] for i in range(n): if arr[i]==1: List.append(i) end=-1 ans=0 istart=0 while end

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])

arr = list(map(int, input().rstrip().split())) #ADITYA SHARMA

result = pylons(k, arr)

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

fptr.close()