[HackerRank] 27. Picking Numbers

def pickingNumbers(a):
    high = 1
    low = 1
    maximum = 0
    for n in a:
        high = a.count(n+1) + a.count(n)
        low = a.count(n-1) + a.count(n)
        maximum = max(maximum, high, low)

    return maximum
            

if __name__ == '__main__':
    n = int(input().strip())
    a = list(map(int, input().rstrip().split()))
    
    result = pickingNumbers(a)
    print(result)