#include <bits/stdc++.h>
using namespace std;
int main()
{
int n, x, y;
cin >> n;
while (n--)
{
cin >> x >> y;
if (x - y == 0 || x - y == 2) cout << x+y - (y%2) << endl;
else cout << "No Number\n";
}
return 0;
}