#include<iostream>

#include<algorithm>
#include<vector>
#include<queue>
#include<stack>
#include<list>
#include<map>
#include<set>

#include<stdio.h>
#include<math.h>
#include<ctype.h>
#include<string.h>

using namespace std;

#define FOR(i,a,b) for(int i=a;i<=b;i++)
#define PB push_back
#define PII pair<int, int>
#define fi first
#define se second
#define MP make_pair

#define SIZE(s) ((int)(s).size())

int cf(int num)
{
	int s = 0;
	while(num > 0)
	{
		s+= num % 10;
		num = num / 10;
	}
	return s;
}

int next(int a)
{
	int ok = cf(a) - 1;
	while(a > 0)
	{
		a--;
		if (cf(a) == ok) return a;
	}
	return 0;
}

int main()
{
	int a;
	while(scanf("%d", &a) == 1)
	{
		printf("%d\n", next(a));
	}
	return 0;
}