#include <cstdio>
using namespace std;
int n,x,y;

int main()
{
	scanf("%d",&n);
	while(n--)
	{
		scanf("%d%d",&x,&y);
		if(x==y)printf("%d\n",(x%2==0)?x*2:(x-1)*2+1);
		else if(x-2==y)printf("%d\n",(x%2==0)?(x-1)*2:(x-1)*2-1);
		else printf("No Number\n");
	}
	return 0;
}