#include <atcoder/all>
#include <bits/stdc++.h>
#define rep(i, a, b) for (ll i = (ll)(a); i < (ll)(b); i++)
using namespace atcoder;
using namespace std;

typedef long long ll;

string san_nasi(string s) {
    int n = s.size();
    string ret;
    bool san = 0;
    rep(i, 0, n) {
        if (san) {
            ret += '9';
            continue;
        } else if (s[i] == '3') {
            san = 1;
            ret += '2';
            continue;
        }
        ret += s[i];
    }
    return ret;
}

string dec(string s) {
    int n = s.size();
    reverse(s.begin(), s.end());
    s[0]--;
    rep(i, 0, n) {
        if (s[i] < '0') {
            s[i + 1]--;
            s[i] = '9';
        }
    }
    while (s.back() == '0')
        s.pop_back();
    reverse(s.begin(), s.end());
    return s;
}

bool san(string s) {
    int sum = 0;
    for (auto c : s) {
        sum += c - '0';
    }
    return sum % 3 == 0;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    string s;
    cin >> s;
    s = san_nasi(s);
    while (1) {
        if (!san(s))
            break;
        s = dec(s);
        s = san_nasi(s);
    }
    cout << s << endl;
}