#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main()
{
  string s;
  cin >> s;
  int n = s.size(), id = n;
  for (int i = 0; i < n; ++i)
  {
    if (s[i] == '3')
    {
      id = i;
      break;
    }
  }
  if (id < n) --s[id];
  for (int i = id + 1; i < n; ++i) s[i] = '9';
  int sum = 0;
  for (auto c : s) sum += c - '0';
  if (sum % 3 == 0)
  {
    for (int i = n - 1; i >= 0; --i)
    {
      if (s[i] != '0')
      {
        --s[i];
        for (int j = i + 1; j < n; ++j) s[j] = '9';
        break;
      }
    }
  }
  cout << s << endl;
}