#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;
    }
    
    int x = n+5;
    rep(i,n) if(s[i]<'4'){
        x = i;
        while(s[x]<='4') x--;
        break;
    }

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

}