#include <iostream>
using namespace std;
int main()
{
    int n,aux,s=0,p=0,k=0;
    cin>>n;
    while(n!=0)
    {
        s=s+n%10;
        n/=10;
    }
    aux=s;
    while(s>9)
    {
        cout<<"9";
        k++;
        s=s-9;
    }
    cout<<s;
    while(p<aux-k-1)
    {
        cout<<"0";
        p++;
    }


}