#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("next.in");
ofstream fout("next.out");
int n,D,i=1,sw;
int main()
{
    fin>>n>>D;
    fin.close();
    if(n%D==0)
        {fout<<n;
        fout.close();}
    else
        while(sw==0)
    {
      if((i+n)%D==0)
            {
                fout<<i+n;
                fout.close();
                sw=1;}
      else
        i++;
    }
    return 0;
}