CF630F.Selection of Personnel
普及/提高-
通过率：0%
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题目描述
One company of IT City decided to create a group of innovative developments consisting from 5 to 7 people and hire new employees for it. After placing an advertisment the company received n resumes. Now the HR department has to evaluate each possible group composition and select one of them. Your task is to count the number of variants of group composition to evaluate.
输入格式
The only line of the input contains one integer n ( 7<=n<=777 ) — the number of potential employees that sent resumes.
输出格式
Output one integer — the number of different variants of group composition.
输入输出样例
输入#1
7
输出#1
29