"""
Project Euler Problem 0 :
Find the sum of all the odd squares which do not exceed 764000.

这是注册问题。
"""

UP_NUM = 764000


def is_even(num: int) -> bool:
    """Check if a number is even."""
    return num & 1 == 0


def main():
    res: list[int] = []
    for i in range(UP_NUM):
        t = (i + 1) ** 2
        if not is_even(t):
            res.append(t)
    print(sum(res))


if __name__ == "__main__":
    main()