#include<stdio.h>
int main() {
	int n;
	scanf("%d",&n);
	while(n--){
		int a,b;
		scanf("%d%d",&a,&b);
		if(a>>31||b>>31||(a^b)&&(a-b-2))printf("No Number\n");
		else if(!(a^b)){
			printf("%d\n",2*b-b%2);
		}
		else{
			printf("%d\n",2*b+2-b%2);
		}
	}
	return 0;
}