#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)s; i < (int)e; ++i)
#define all(a) (a).begin(), (a).end()

int main() {
    cin.tie(nullptr);
    
    int T;
    cin >> T;
    
    rep(test, 0, T) {
        ll N, M;
        cin >> N >> M;
        
        ll k = (N + 3) / 4;
        ll left = 8 * k - N;
        
        if (left >= M) cout << k << '\n';
        else {
            ll d = M - left;
            cout << k + (d + 7) / 8 << '\n';
        }
    }
}