#include <stdio.h>
#define INFINIT 100000000

int main()
{
  long long  int di=0,nr=0,k=0;

	freopen("next.in","r",stdin);
	freopen("next.out","w",stdout);
    scanf("%I64lld\n",&nr);
	scanf("%I64lld",&di);
printf("%I64lld",(nr/di+1)*di);
  return 0;
}