// ConsoleApplication3.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <algorithm>
using namespace std;

int main()
{
    int t, nat, dif, min,res;
    cin >> t;
    while (t--) {
        int x, y;
        cin >> x >> y;
        if (y > x) {
            cout << y << endl;
            continue;
        }

        nat = x / y;
        
        dif = abs(y - nat);
        min = x + dif;

        while (min > x) {
            min -= y;
        }
        res = min + y;
        cout << res << endl;
    }
    
}

// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

// Tips for Getting Started: 
//   1. Use the Solution Explorer window to add/manage files
//   2. Use the Team Explorer window to connect to source control
//   3. Use the Output window to see build output and other messages
//   4. Use the Error List window to view errors
//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file