import os



def balancedSum(arr):
    # Write your code here
    length = arr[0]
    target = arr[1:]
    target.sort()
    for i in range(length):
        if(target[:i] == target[i:]):
            return i
        

if __name__ == '__main__':
    # fptr = open(os.environ['OUTPUT_PATH'], 'w')

    arr_count = int(input().strip())

    arr = []

    for _ in range(arr_count):
        arr_item = int(input().strip())
        arr.append(arr_item)

    result = balancedSum(arr)

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

    fptr.close()