1480: 算法提高 素数求和

Memory Limit:256 MB Time Limit:1.000 S
Judge Style:Text Compare Creator:
Submit:1 Solved:1

Description

输入一个自然数n,求小于等于n的素数之和

Input

输入描述:
  测试样例保证 2 <= n <= 2,000,000

Sample Input Copy

2

Sample Output Copy

2

HINT


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