#include<iostream>

using namespace std ;
int main()
{
   int t ;
   cin>>t;
   while(t--)
   {

      double x ,y;
       cin>>x>>y;
       if(y>=x) cout<<y<<endl;
       else
       {
           long long  temp = x/y;
           if(temp*y >=x )cout<<temp*y<<endl;
           else cout <<(temp+1) * y <<endl;
          // cout<<temp*y<<endl;
       }

   }
}