#include <bits/stdc++.h>
using namespace std;
#define int long long
#define rep(i, n) for (int i = 0; i < (int)n; ++i)

signed main() {
	int T;
	cin >> T;
	rep(t, T) {
		int N, M;
		cin >> N >> M;
		int l = 0, r = N+M;
		while (l < r) {
			int m = l + (r - l) / 2;
			if (N <= 4*m && N+M <= 8*m) r = m;
			else l = m + 1;
		}
		cout << l << endl;
	}
}