#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin>>n;
    if(n%4==0)
    {
        cout<<n<<endl;
        return 0;
    }
    else
    {
        int temp=n,sum=0;
        while (n)
        {
            int k = n % 10;
            sum += k;
            n /= 10;
        }
        if(temp%4==0)
        {
            cout<<temp<<endl;
            return 0;
        }
        temp=n+1;
    }
}