#include <bits/stdc++.h>
#include <atcoder/all>

using namespace std;
using ll = long long;
#define rep(i, s, t) for (ll i = s; i < (ll)(t); i++)
#define all(x) begin(x), end(x)
template <class T> bool chmin(T& x, T y) {
	return x > y ? (x = y, true) : false;
}
template <class T> bool chmax(T& x, T y) {
	return x < y ? (x = y, true) : false;
}

string dec(string s) {
	if (s == "4") return "";
	int n = s.size();
	for (int i = n - 1; i >= 0; i--) {
		if (s[i] == '4') continue;
		return s.substr(0, i) + "4" + string(n - 1 - i, '5');
	}
	return string(n - 1, '5');
}

void solve() {
	string s;
	cin >> s;
	int n = s.size();
	string ans = s;
	rep(i, 0, n) {
		if (s[i] == '4' || s[i] == '5') continue;
		if (s[i] <= '3') {
			if (i == 0) ans = string(n - 1 - i, '5');
			else ans = dec(s.substr(0, i)) + string(n - i, '5');
		} else {
			ans = s.substr(0, i) + string(n - i, '5');
		}
		break;
	}
	cout << ans << '\n';
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cout << fixed << setprecision(15);
	int t = 1;
	// cin >> t;
	while (t--) solve();
}