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Counting Triangles

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 4131    Accepted Submission(s): 2019


Problem Description
Given an equilateral triangle with n the length of its side, program to count how many triangles in it.



 

Input
The length n (n <= 500) of the equilateral triangle's side, one per line.

process to the end of the file
 

Output
The number of triangles in the equilateral triangle, one per line.
 

Sample Input
1
2
3
 

Sample Output
1
5
13
 

Author
JIANG, Jiefeng
 

Source
ZOJ Monthly, June 2003
 

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