#include<iostream>
using namespace std;

int main()
{
	int times, a, b;
	
	cin >> times;
	for (int i = 0; i < times; i ++)
	{
		cin >> a >> b;
		
		if (a - b != 0 && a - b != 2)
			cout << "No Number" << endl;
		else if (a - b == 2)
		{
			if (a % 2 == 0)
				cout << 2*a - 2 << endl;
			else
				cout << a/2*4 - 1 << endl;
		}
		else if (a - b == 0)
		{
			if (a % 2 == 0)
				cout << 2*a << endl;
			else 
				cout << a/2*4 + 1 << endl;
		}
	}
	
	return 0;
}