#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @File  : rander.py
# @Author: A.O.
# @Date  : 2018/5/5 
# @license : Copyright(C), Nanyang Institute of Technology 
# @Contact : 1837866781@qq.com 
# @Software : PyCharm
import random
a = random.randint(0,20)
print(a)