def calculate_kdj(high, low, close, n):
    # Calculate RSV
    true_range = [max(high[i] - low[i], abs(high[i] - close[i-1]), abs(low[i] - close[i-1])) for i in range(len(high))]
    rsv = [0]*len(close)
    for i in range(n, len(close)):
        avg_true_range = sum(true_range[i-n:i]) / n
        if avg_true_range == 0:
            rsv[i] = 0
        else:
            rsv[i] = (close[i] - min(low[i-n:i])) / avg_true_range * 100

    # Calculate K, D, J
    k = [rsv[n]]
    d = []
    j = []
    for i in range(n+1, len(close)):
        k.append((2*k[-1]+rsv[i])/3)
        d.append((2*d[-1]+k[-1])/3)
        j.append(3*k[-1]-2*d[-1])

    return k, d, j


high = [...] # historical high prices
low = [...] # historical low prices
close = [...] # historical closing prices
n = 9 # period parameter for KDJ calculation

k, d, j = calculate_kdj(high, low, close, n)
print("K:", k)
print("D:", d)
print("J:", j)