// 2023 IUSB Programming Competition
// Round 1 Problem 2
// Round To Even
// Solution by Liguo Yu

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
    double number;
    cin >> number;
    
    if(floor(number)+0.5 != number)
    {
        cout << round(number) << endl;
    }
    
    else
    {
        int result = (int)floor(number);
        if (result%2 == 1) result = result + 1;
        cout << result << endl;
    }
    
    return 0;
}