#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
ll inf_ll = 9223372036854775807;
#define rep(i, n) for (ll i = 0; i < (ll)(n); i++)
using mint = atcoder::modint998244353;
using mint1 = atcoder::modint1000000007;
using Pa = std::pair<ll, ll>;

int Yes(bool x){
    if(x) cout << "Yes";
    else cout << "No";
    cout << endl;
    return 0;
}

string f(string &S){
    ll N = S.size();
    bool x = false;
    ll M = 0;
    rep(i, N){
        if(x){
            S[i] = '9';
            continue;
        }
        if(S[i] == '3'){
            x = true;
            S[i] = '2';
        }
        M += (S[i] - '0');
    }
    if(x) return f(S);
    if(M % 3 > 0) return S;
    ll j = N-1;
    while(j >= 0){
        if(S[j] > '0'){
            S[j] = S[j] - 1;
            break;
        }
        S[j] = '9';
        j--;
    }
    return f(S);
}

int main(){
    string N;
    cin >> N;
    string ans = f(N);
    bool x = true;
    for(auto i : ans){
        if(i == '0' && x) continue;
        x = false;
        cout << i;
    }
}