#include<fstream>

using namespace std;

unsigned long long long int n,d;

int main()
{
    ifstream fin("next.in");
    ofstream fout("next.out");
    fin>>n>>d;
     while(n%d != 0)
         n+=1;
     fout<<n;

  fin.close();
  fout.close();
  
return 0;

}