def f(n):
    res = 0
    cont_op = 0
    for i in range(1, n*n+1, 2):
        for j in range(i//2, 2*i+1, i//2+1):
            k = j+1
            while k <= n+j:
                res += abs(j - i)
                cont_op += 1
                k += k//2+1
    return cont_op