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import math
arr = list(range(1, 10001))
num = int(input('Число: '))
log = int(math.log2(len(arr)))
lens = int(len(arr)/2)
arr1 = arr[:lens]
arr2 = arr[lens:]
i = 0
while i <= log:
print('Шаг', i, 'из', log)
if arr1:
if num == arr1[0]:
print(arr1[0])
break
if num == arr1[-1]:
print(arr1[-1])
break
if arr2:
if num == arr2[0]:
print(arr2[0])
break
if num == arr2[-1]:
print(arr2[-1])
break
if num in arr1:
len1 = arr1
arr1 = arr1[:int(len(arr1)/2) if int(len(arr1)/2) == 0 else int(len(arr1)/2+1)]
arr2 = len1[int(len(arr1)/2) if int(len(arr1)/2) == 0 else int(len(arr1)/2+1):]
if num in arr2:
len2 = arr2
arr2 = arr2[:int(len(arr2)/2) if int(len(arr2)/2) == 0 else int(len(arr2)/2+1)]
arr1 = len2[int(len(arr2)/2) if int(len(arr2)/2) == 0 else int(len(arr2)/2+1):]
i += 1