#include<fstream.h>

unsigned long long n,d,m,i,x;

int main ()
{       ifstream f("next.in");
	ofstream g("next.out");
	f>>n;
	f>>d;
	x=n%d;
	m=n+d-x;
	g<<m;
	g.close();
	f.close();
	return 0;
}