import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int t = sc.nextInt();
		for (int z = 0; z < t; z++) {
			int a = sc.nextInt();
			int b = sc.nextInt();

			System.out.println(a * b + b);
		}
		sc.close();
	}
}