#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    string s;
    cin >> s;
    int n = s.size();
    bool t = true;
    string ans;
    for (char c : s) {
        if (!t) {
            ans.push_back('5');
            continue;
        } else {
            if (c >= '6') {
                t = false;
                ans.push_back('5');
            } else if (c <= '3') {
                int m = ans.size();
                for (int i = m - 1; i >= 0; i--) {
                    if (ans[i] == '5') {
                        ans[i]--;
                        t = false;
                        break;
                    } else {
                        ans[i]++;
                    }
                }
                if (t) {
                    rep(i, n - 1) cout << '5';
                    cout << endl;
                    return 0;
                } else {
                    ans.push_back('5');
                }
            } else {
                ans.push_back(c);
            }
        }
    }
    cout << ans << endl;
    return 0;
}