def pi_squared_over_6(N: int) -> float:
    return sum(x**(-2) for x in range(1,N))

fn pi_squared_over_6(N: u64) -> f64 {
    (1..N).map(|x| 1.0 / ((x*x) as f64)).sum()
}

piSquaredOver6 :: Integer -> Double
-- no capital N in Haskell :(
piSquaredOver6 n = sum $ map (\x -> 1 / fromIntegral (x * x)) [1..n]

double pi_squared_over_6(unsigned int N) {
    double sum = 0.0;
    for (int i = 1; i < N; i++) {
        sum += 1.0 / (i*i);
    }
    return sum;
}

import numpy as np

def pi_squared_over_6(N: int) -> float:
    x = np.ones(N)
    r = np.arange(1,N)
    sq = np.square(r)
    div = np.divide(x, sq)
    return float(np.sum(div))

def pi_squared_over_6(N: int) -> float:
    CHUNKS = 25000
    SIZE = N // CHUNKS
    s = 0.0
    x = np.ones(N // CHUNKS - 1)
    for i in range(CHUNKS):
        N_tmp = i * SIZE
        r = np.arange(N_tmp + 1, N_tmp + SIZE)
        sq = np.square(r)
        div = np.divide(x, sq)
        s += np.sum(div)
        # മെമ്മറി ഡീലോക്കേറ്റ് ചെയ്യുക
        del sq
        del div
        del r
        
    return s