from functools import cached_property


class HeavyComputer:
    def __init__(self, n):
        self.n = n

    @cached_property
    def result(self):
        # Calcula la suma de range(n) — se computa una sola vez y se cachea
        sumatory = 0
        for i in range(self.n):
            sumatory += i
        return sumatory

def compute_heavy(n):
    h = HeavyComputer(n)
    return h.result