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

int main() {
    int N;
    cin >> N;
    for (int i = 1e5;; i++) {
    	string str = to_string(i);
    	string rev = to_string(i);
    	reverse(rev.begin(), rev.end());
    	string cur = str;
    	cur += rev;
    	cur += '9';
    	long long x = stoll(cur);
    	if (x % N == 0) {
    		cout << x << endl;
    		return 0;
    	}
    	for (int k = 0; k < 10; ++k) {
    		cur = str;
    		cur += ('0' + k);
    		cur += rev;
    		cur += '9';
    		long long x = stoll(cur);
    		if (x % N == 0) {
    			cout << x << endl;
    			return 0;
    		}
    	}
    }
}