#include <bits/stdc++.h>
#define rep(i, n) for(long long i = 0; i < n; i++)
#define ALL(v) (v).begin(), (v).end()
#define rALL(v) (v).rbegin(), (v).rend()
using namespace std;

using lint = long long;
using ld = long double;

int main() {
    int t;
    cin >> t;
    while (t--) {
        int n, m;
        cin >> n >> m;
        int q = n / 4, r = n % 4;
        if (r == 0) {
            if (q * 4 >= m) {
                cout << q << endl;
            } else {
                m -= q * 4;
                int qq = m / 8 + (m % 8 != 0);
                cout << q + qq << endl;
            }
        } else {
            if (q * 4 + (8 - r) >= m) {
                cout << q + 1 << endl;
            } else {
                m -= q * 4 + (8 - r);
                int qq = m / 8 + (m % 8 != 0);
                cout << q + 1 + qq << endl;
            }
        }
    }
}