#include <iostream>
#include <cmath>
using namespace std;
void numfind(int N)
{
int tmp = N;
int start,i,sum,tmp2 = 0;
for(i = -1; tmp; i++)
tmp /= 10;
start = round(pow(10,i)) - 9*i;
tmp = start;
while(1)
{
sum = tmp;
tmp2 = tmp;
while(tmp2)
{
sum += tmp2 % 10;
tmp2 /= 10;
}
if(sum == N)
{
cout << tmp;
return;
}
if(tmp == N)
{
cout << '0';
return;
}
tmp++;
}
}
int main() {
int N;
cin >> N;
numfind(N);
}