import java.util.*;
import java.lang.*;
class Main
{
public static void main (String[] args) throws java.lang.Exception
{ Scanner sc=new Scanner(System.in);
int t=sc.nextInt();
while(--t>=0)
{ int x=sc.nextInt();
int y=sc.nextInt();
if(x%2 == 0 && y%2 == 0)
System.out.println(x+y);
else if(x%2 == 1 && y%2 == 1)
System.out.println(x+y-1);
else
System.out.println("No Number");
}
}
}