大佬们，请求支援！！

#include<bits/stdc++.h>
using namespace std;

int main() {
	int k;
	cin>>k;
	int a,b,c,d,e;
	int flag = 0;
	int kkksc01 = 0,kkksc02 = 0,kkksc03 = 0;
	for(int i=10000; i<=30000; i++) {
		kkksc01 = 0;
		kkksc02 = 0;
		kkksc03 = 0;
		a=0;
		b=0;
		c=0;
		d=0;
		e=0;

		a = i % 10;
		b = i / 10 % 10;
		c = i /100 %10;
		d = i /1000 %10;
		e = i / 10000;
		kkksc01 = a * 100 + b * 10 + c;
		kkksc02 = b * 100 + c * 10 + d;
		kkksc03 = c * 100 + d * 10 + e;
		if(kkksc01 % k == 0 && kkksc02 % k == 0 && kkksc03 % k == 0) {
			cout<<i<<endl;
			flag = 1;
		}
	}
	if(flag == 0) {
		cout<<"No";
	}
	return 0;
}