1211: 求1+3+5+...+n的值

Memory Limit:128 MB Time Limit:1.000 S
Judge Style:Text Compare Creator:
Submit:37 Solved:18

Description

   输入n(奇数)求1+3+5+...+n的和

Input

奇数n

Output

1+3+5+...+n

Sample Input Copy

7

Sample Output Copy

16