/* -*- coding: utf-8 -*-
 *
 * 2921.cc:  No.2921 Seated in Classroom - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

/* typedef */

using ll = long long;

/* global variables */

/* subroutines */

/* main */

int main() {
  int tn;
  scanf("%d", &tn);

  while (tn--) {
    int n, m;
    scanf("%d%d", &n, &m);

    int x0 = 0, x1 = n + m;
    while (x0 + 1 < x1) {
      int x = ((ll)x0 + x1) / 2;
      if ((ll)x * 4 >= n && (ll)x * 8 >= n + m) x1 = x;
      else x0 = x;
    }

    printf("%d\n", x1);
  }

  return 0;
}