#include <iostream>
using namespace std;
int main() {
	int t;
	cin >> t;
	int arr[t];
	for (int j=0;j<t;j++){
	    int x,y;
	    cin>>x>>y;
	    if(x%y==0 && x<=y){
	        cout<<y<<endl;
	    }
	    else if (x%y==0){
	        cout<<x<<endl;
	    }
	    else {
	        int k = x+1;
	        while(1){
	            if (k%y==0){ cout<<k<<endl; break;}
	            k++;
	        }
	    }
	}
	//for (int i=0;i<t;i++) cout <<arr[i]<<endl;
	return 0;
}