#include<iostream>

using namespace std;

using ll = long long;

int main() {
    ios::sync_with_stdio(false);
    std::cin.tie(nullptr);

    ll n;
    cin >> n;
    auto f = [&](ll x)->ll {
        ll t = 1;
        while (t < x) t *= 10;
        return x * (t + 1);
        };
    while (n < 1000000000) n = f(n);
    cout << n << endl;

    return 0;
}