#include <bits/stdc++.h>

#define el '\n'
#define ll long long
#define ld long double

#define Beevo ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

using namespace std;

void testCase() {
    ll n;
    cin >> n;

    string s = to_string(n);

    for (int i = 1; i < s.size(); i++)
        s[i] = '0';

    ll a = stoll(s);

    ll b = a, p = 1;

    for (int i = 0; i < s.size() - 1; i++)
        p *= 10;

    b += p;

    if (b - n <= n - a)
        cout << b;
    else
        cout << a;
}

signed main() {
    Beevo

    int T = 1;
//    cin >> T;

    while (T--)
        testCase();

    return 0;
}