5841: K-5-9-3

Memory Limit:128 MB Time Limit:1.000 S
Judge Style:Text Compare Creator:
Submit:0 Solved:0

Description

输入一个正整数n,生成一个n*n的蛇形方阵

Input

一行一个正整数n,1<=n<=20

Output

共n行,每行n个正整数,每个正整数占5列

Sample Input Copy

5

Sample Output Copy

1    2    6    7    15
3    5    8    14   16
4   9   13   17   22
10   12   18   21  23
11   19   20   24   25