#include<bits/stdc++.h>
using namespace std;
typedef unsigned long long ull;
int sum (ull n){
    int result(0);
    while (n > 0){
        result += (n % 10);
        n /= 10;
    }
    return result;
}
int main(){
    ull n;
    cin >> n;
    for (ull l(n); l <= min((ull)63500000, n * 100); l += n){
        if (l == sum(l) * n){
            cout << l;
            exit(0);
        }
    }
    cout << "0";
}