#include <iostream>

using namespace std;
int suma(int n)
{
    int s = 0;
    while(n)
    {
        s = s + n % 10;
        n/=10;
    }
   return s;
}

int main()
{
    int n;
    cin >> n;
    int s= suma(n);
    int cnt = s;
    while(s >= 9)
		cout << 9, s -= 9, cnt --;

	cout << s, cnt --;

	while(cnt)
		cout << 0, cnt--;


    return 0;
}