#include <fstream>

using namespace std;

ifstream f ("next.in");
ofstream g ("next.out");

unsigned long long n, d;

int main()
{
   f >> n >> d;
   if (n % d == 0)
      g << n;
   else
   {
       g << (n / d + 1) * d;
   }
    return 0;
}