k-rounding
For a given positive integer n denote its k-rounding as the minimum positive integer x, such that x ends with k or more zeros in base 10 and is divisible by n.
For example, 4-rounding of 375 is 375·80 = 30000. 30000 is the minimum integer such that it ends with 4 or more zeros and is divisible by 375.
Write a program that will perform the k-rounding of n.
Input
The only line contains two integers n and k (1 ≤ n ≤ 109, 0 ≤ k ≤ 8).
Output
Print the k-rounding of n.
Example
Input
375 4
Output
30000
Input
10000 1
Output
10000
Input
38101 0
Output
38101
Input
123456789 8
Output
12345678900000000
题意：对于一个数字n,定义它的"k阶数"为最小的正整数x,这里x以k个或者更多的0结尾,且能够被n整除. 比如375的4阶数为 375*80 = 30000.
#include<stdio.h>
#include<iostream>
#include<algorithm>
#include<math.h>
using namespace std;
int main()
{
long long n,k,m=1;
cin>>n>>k;
while(k--)
m*=10;
cout<<(n*m)/__gcd(n,m)<<endl;
}