Ывык

from random import randint


def random_list(size=0):
    return list([randint(0, 100) for x in range(size)])


def bin_search(array, number):
    low = 0
    high = len(a) - 1
    while low <= high:
        mid = (low + high) // 2
        if number < array[mid]:
            high = mid - 1
        elif number > array[mid]:
            low = mid + 1
        else:
            return mid
    else:
        return -1


n = int(input())
a = random_list(n)
a.sort()
print(a)

x = int(input())

print(bin_search(a, x))