2 shunfurh shunfurh 于 2017.09.03 20:30 提问

Counting Triangles

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

1个回答

caozhy
caozhy   Ds   Rxr 2017.09.17 22:41
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