CSU 2018年12月月赛 F(2218): Finding prime numbers

Description

xrdog has a number set. There are 95 numbers in this set. They all have something in common and are all positive integers less than 500. The naughty xiao zhuan has deleted one of the numbers in the set. Can you find the number that xiao zhuan deleted?

The following is a set of numbers after deleting a number:

{131,193,5,479,179,101,199,137,23,401,157,197,313,167,127,7,379,109,13,29,73,229,83,239,97,37,53,347,293,113,311,467,47,373,2,151,337,263,461,367,223,103,389, 211,17,443,251,227,11,457,41,331,107,257,59,271,269,19,433,71,67,79,421,463,317,277,241,397,139,353,359,173,449,409,383,191,233,89,283,419,349,3,163,439, 31,181,307,431,61,43,149,487,491,281 }

Input

There is no input.

Output

Output a positive integer indicating the number that was deleted.

Sample Input

Non-existent

Sample Output

Unknown

题意：辣鸡出题人，不考虑老年人老眼昏花，就是500内的素数，他给删了一个，要你找，又懒得全输进去，一个个的看，看到眼花缭乱，还有看到499没有。

#include <iostream>
#include <cstring>
#include <cstdio>
#include <algorithm>
#include <math.h>
#include <set>
using namespace std;
int n;
int main()
{
    printf("499\n");
    return 0;
}

/**********************************************************************
    Problem: 2218
    User: therang
    Language: C++
    Result: AC
    Time:0 ms
    Memory:2024 kb
**********************************************************************/