#include<fstream>
using namespace std;
ifstream in("next.in");
ofstream out("next.out");
int main()
{
	unsigned long long n,d,i;
	in>>n>>d;
	i=n;
	if(n%d==0)
	{
		out<<n;
		return 0;
	}
	while(i%d!=0)
		i++;
	out<<i;
	return 0;
}