#include<cstdio>

int main()
{
	int n;
	scanf("%d",&n);
	int i,x,y;
	for(i=1;i<=n;i++)
	{
    	scanf("%d%d",&x,&y);
    	if (x==y||x-2==y)
    	    printf("%d\n",x+y-x%2);
    	else
    	    printf("No Number\n");
    }
}