#include<fstream>

using namespace std;

unsigned long int n;
long int d;
int r;

int main()
{
    ifstream fin("next.in");
    ofstream fout("next.out");
    fin>>n>>d;
    r=n%d;
    fout<<n+d-r;
    
fin.close();
fout.close();

return 0;

}