#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  string s;
  cin >> s;
  reverse(all(s));
  for (int i = ssize(s) - 1; i >= 0; i--) {
    if (s[i] == '3') {
      s[i] = '2';
      while (i--) s[i] = '9';
      break;
    }
  }
  auto calc = [&]() {
    int r = 0;
    for (char c : s | views::reverse) r = (10 * r + (c - '0')) % 3;
    return r;
  };
  if (!calc()) {
    int i = 0;
    while (s[i] == '0') i++;
    s[i]--;
    if (s[i] == '3') s[i]--;
    while (i--) s[i] = '9';
    if (!calc()) s[0]--;
    while (s.back() == '0') s.pop_back();
  }
  reverse(all(s));
  cout << s << '\n';
}