CodeForces - 633B A Trivial Problem 数论-阶乘后缀0

A Trivial Problem

Mr. Santa asks all the great programmers of the world to solve a trivial problem. He gives them an integer m and asks for the number of positive integers n, such that the factorial of n ends with exactly m zeroes. Are you among those great programmers who can solve this problem?

Input

The only line of input contains an integer m (1 ≤ m ≤ 100 000) — the required number of trailing zeroes in factorial.

Output

First print k — the number of values of n such that the factorial of n ends with mzeroes. Then print these k integers in increasing order.

Examples

Input

Output

5
5 6 7 8 9

Input

Output

Note

The factorial of n is equal to the product of all integers from 1 to n inclusive, that is n! = 1·2·3·...·n.

In the first sample, 5! = 120, 6! = 720, 7! = 5040, 8! = 40320 and 9! = 362880.

题目给出后缀0个数，输出n!满足条件的所有n值。

数论题。由于因子里含有偶数，所以非零末尾一定是偶数。产生0的因数一定包含5，所以题目就转化为寻找阶乘因子中含有5的个数。

#include<stdio.h>

#include<string.h>

#include<stdlib.h>

#include<math.h>

#include<set>

#include<algorithm>

#define MAX 1005

#define INF 0x3f3f3f3f

using namespace std;

int a[MAX];

int main()

{

    int n,c,i,j;

    scanf("%d",&n);

    c=;

    for(i=;i<=;i++){  //注意这里是枚举阶乘的因子，需要大于后缀0最长的情况

        int ii=i;

        while(ii%==&&ii>){

            c++;

            ii/=;

        }

        if(c==n){

            printf("5\n");

            printf("%d",i);

            for(j=i+;j<=i+;j++){

                printf(" %d",j);

            }

            break;

        }

        else if(c>n){

            printf("0\n");

            break;

        }

    }

    return ;

}

巴特西

CodeForces - 633B A Trivial Problem 数论-阶乘后缀0

A Trivial Problem

最新文章

热门文章