#include <fstream>
using namespace std;
ifstream f("next.in");
ofstream g("next.out");
unsigned long long n,d,s;
unsigned long long v[10000000];
int main()
{
    f>>n;
    f>>d;
    s=n/d;
    s=s*d;
    if (s==n) g<<s;
      else g<<s+d;
    f.close();
    g.close();
    return 0;
}