https://blog.gongquiz.com/2022/09/17/%eb%ac%bc-1kg-%ec%9d%b4-100%e2%84%83%ec%97%90%ec%84%9c-%ec%a6%9d%eb%b0%9c%ed%95%a0-%eb%95%8c-%ec%97%94%ed%8a%b8%eb%a1%9c%ed%94%bc%ec%9d%98-%ec%a6%9d%ea%b0%80%eb%9f%89%ec%9d%80-%eb%8b%a8-%ec%9d%b4/