#include <bits/stdc++.h>
#include <unordered_map>
#include <stdlib.h>
#include <atcoder/all>
using namespace atcoder;
using namespace std;
#define rep(i, a, n) for(ll i = a; i < n; i++)
#define rrep(i, a, n) for(ll i = a; i >= n; i--)
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define all(x) (x).begin(), (x).end()
//constexpr ll MOD = 1000000007;
constexpr ll MOD = 998244353;
constexpr int IINF = 1001001001;
constexpr ll INF = 1LL<<60;
template<class t,class u> void chmax(t&a,u b){if(a<b)a=b;}
template<class t,class u> void chmin(t&a,u b){if(b<a)a=b;}

using mint = modint998244353;

ll gcd(ll a, ll b){
    if(a%b == 0){
      return b;
    }else{
      return gcd(b, a%b);
    }
}

ll lcm(ll a, ll b){
    return a*b / gcd(a, b);
}

ll powMod(ll x, ll n) {
    if (n == 0) return 1 % MOD;
    ll val = powMod(x, n / 2);
    val *= val;
    val %= MOD;
    if (n % 2 == 1) val *= x;
    return val % MOD;
}

int main() {
    string s; cin >> s;
    ll n = s.size();
    auto next = [&](string &t) -> void {
        rrep(i,n-1,0){
            if(t[i] != '0'){
                t[i] = (char)(t[i]-1);
                return;
            }
            else t[i] = '9';
        }
    };
    auto x = [&](string &t){
        rep(i,0,n){
            if(t[i] == '3'){
                t[i] = '2';
                rep(j,i+1,n){
                    t[j] = '9';
                }
                return;
            }
        }
        next(t);
    };
    auto count = [&](string &t) -> bool {
        rep(i,0,n) if(t[i] == '3') return true;
        ll cnt = 0;
        rep(i,0,n) cnt += (t[i]-'0')%3;
        return cnt%3 == 0;
    };
    while(count(s)) x(s);
    cout << s << endl;

    return 0;
}