1794 Counting Triangles
题目描述
Given an equilateral triangle with n the length of its side, program to count how many triangles in it.
输入格式:
The length n (n <= 500) of the equilateral triangle's side, one per line.
process to the end of the file
输出格式:
The number of triangles in the equilateral triangle, one per line.
输入样例 复制
1 2 3
输出样例
复制
1 5 13
