def median(data):
    num = len(data)
    if num % 2 == 0:
        return (data[num//2 - 1] + data[num//2]) / 2
    
    return data[(num-1) // 2]

def quartiles(arr):
    n = len(arr)
    arrX = sorted(arr)
    Q2 = median(arrX)
    
    if n % 2 != 0:
        Q1 = median(arrX[:(n-1)//2])
        Q3 = median(arrX[(n+1)//2:])
    else:
        Q1 = median(arrX[:(n//2)])
        Q3 = median(arrX[(n//2):])
    
    return int(Q1), int(Q2), int(Q3)