OIG XVII - pod

// https://szkopul.edu.pl/problemset/problem/RKrpGzYaz31yu9TyXMjzCEVV/site/?key=statement
// XVII OIJ (1 etap)

#include <iostream>

typedef long long var;

var res(var N) {
    var r = N % 9;

    var r1 = N % 10;

    if (r1 == 0) {
        N += (9 - r);
    } else if ((r1 - r) > 0) {
        N -= r;
    } else if ((r1 + (9 - r)) < 10) {
        N += (9 - r);
    }

    return N;
}

int main() {
    var N;
    std::cin >> N;

    std::cout << res(N);

    return 0;
}