#include <iostream>

using namespace std;

int main()
{
    int N; 
    cin >> N;
    
    if(N % 2 == 0)
        cout << N << endl;
    else 
    {
        N -= 100;
        while(N % 4 != 0)
        {
            N++;
        }

        cout << N << endl;
    }
}