#include <iostream>
 
using namespace std;
 
int share(int n, int sum);
 
int main(void)
{
    int n;
    cin >> n;
 
    for (int i = 1; i <= n; i++)
    {
        int sum = i;
        sum = share(i, sum);
 
        if (sum == n)
        {
            cout << i << endl;
            return 0;
        }
    }
    cout << 0 << endl;
    return 0;
}
 
int share(int n, int sum)
{
    sum += n % 10;
    n /= 10;
 
    if (n > 0)
        return share(n, sum);
    else
        return sum;
}

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