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

int main(){
    string s;
    cin >> s;
    int n = s.size();

    // 444... < N
    rep(i,n){
        if(s[i]<'4'){
            rep(j,n-1) cout << 5;
            cout << endl;
            return 0;
        }
        if(s[i]>'4') break;
    }

    bool f = false;
    rep(i,n){
        if(f || '5'<=s[i]){
            cout << 5;
            if('5'<s[i]) f = true;
        }
        else cout << 4;
    }
    cout << endl;

}