#!/usr/bin/python
# -*- coding: utf-8 -*-
"""
-------------------------------------------------
   File Name：     lianxi1.py
   Description :
   Author :       changyy
   date：          2020/4/10 0010 16:05
-------------------------------------------------
   Change Activity:
                   2020/4/10 0010 16:05
-------------------------------------------------
"""
__author__ = 'changyy'


sum1 = 0
for i in range(1, 101):
    if i % 2 == 1:
        sum1 = sum1 + i
print(sum1)
