#include <bits/stdc++.h>

using namespace std;

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    int t;
    long long n, k;
    cin >> t;
    while (t--)
    {
        cin>>n>>k;
        if(k>=n+1)
            cout<<(n+1)/2<<endl;
        else
        {
            cout<<k/2<<endl;
        }
    }
    return 0;
}