#include<iostream>
using namespace std;
int main()
{
	int n;
	scanf("%d",&n);
	while(n--){
		int x,y;
		scanf("%d%d",&x,&y);
		if(y>x||(x==1&&y==0)||x-y==1||x-y>2)  printf("No Number\n");
		else {
			if(x%2==0) printf("%d\n",x+y);
		    else printf("%d\n",x+y-1);
		}
	}
	return 0;
}