题目描述
Print sum of prime numbers upto n
Input
n - the number till which sum has to be done.
Output
print sum of primes ≤n.
Example
Input:
5
Output:
10
输入格式
见题面
输出格式
见题面
样例输入
5
样例输出
10
Print sum of prime numbers upto n
Input
n - the number till which sum has to be done.
Output
print sum of primes ≤n.
Example
Input:
5
Output:
10
见题面
见题面