#include <fstream.h>
ifstream f("next.in");
ofstream g("next.out");


int main()
{
	long long n,m,d;
	long long  p;

f>>n>>d;
p=n%d;
n+=d%d-p%d;
g<<n<<"\n";
f.close();
g.close();
return 0;
  }