#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define ll long long
#define ld long double
#define out(x) cout<<x<<'\n'
#define all(v) v.begin(),v.end()
#define rep(i,n) for(int i=0;i<(ll)(n);i++)
template<class T> inline bool chmin(T& a, T b) {if(a > b){a = b; return true;} else {return false;}};
template<class T> inline bool chmax(T& a, T b) {if(a < b){a = b; return true;} else {return false;}};
const ll INF=(1LL<<60);
const ll mod=998244353;
using Graph = vector<vector<ll>>;
using Network = vector<vector<pair<ll,ll>>>;
using Grid = vector<string>;
const vector<ll> dx = {0, 1, 0, -1};
const vector<ll> dy = {1, 0, -1, 0};

int main() {
    string N;
    cin >> N;
    for (int i = 0; i < N.size(); i++) {
        if (N[i] == '3') {
            N[i] = '2';
            for (int j = i + 1; j < N.size(); j++) {
                N[j] = '9';
            }
            break;
        }
    }
    ll r = 0;
    rep(i, N.size()) {
        r += (N[i] - '0');
    }
    if (r % 3 != 0) {
        out(N);
    }
    else {
        for (int i = N.size() - 1; i >= 0; i--) {
            if (N[i] != '0') {
                N[i] = (N[i] - '0' - 1) + '0';
                if (N[i] == '3') {
                    N[i] = '2';
                }
                for (int j = i + 1; j < N.size(); j++) {
                    N[j] = '9';
                }
                break;
            }
        }
        out(N);
    }
}