#include <string>
#include <cstdio>
#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char ** argv)
{
	int n;
	while (1 == scanf("%d", &n))
	{
		int cislo = n;
		int soucet = 0;
		while (n>=10)
		{
			soucet += n%10;
			n /= 10;
		}
		soucet += n;

		for (int i = 1; ; i*=10)
		{
			int novySoucet = 0;
			int noveCislo = cislo - i;
			int vysledek = noveCislo;
			while (noveCislo >= 10)
			{
				novySoucet += noveCislo%10;
				noveCislo /= 10;
			}
			novySoucet += noveCislo;

			if (soucet - 1 == novySoucet)
			{
				cout << vysledek << endl;
				break;
			} 
		}
	}

	return 0;
}