import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        for(int i = 0; i < n; i++){
            int total = 0;
            int a = sc.nextInt();
            int b = sc.nextInt();
            int stress = a * b;
            System.out.println(b + stress);
        }
    }
}