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

int main() {
    int N;
    cin >> N;
    long long k = (1e9 + N - 1) / N;
    int x = 0;
    while ((k + x) % 10 != 1) x++;
    k += x;
    for (long long i = k; i <= 1e9 + 1e9; i += 10) {
    	long long S = N * i;
    	string str = to_string(S);
    	bool f = true;
    	for (int m = 0; m < str.size() / 2; ++m) {
    		if (str[m] != str[str.size() - 2 - m]) f = false;
    	}
    	if (f) {
    		cout << str << endl;
    		break;
    	}
    }
}