#![allow(non_snake_case, unused_must_use, unused_imports)]
use std::io::{self, prelude::*};

fn main() {
    let (stdin, stdout) = (io::read_to_string(io::stdin()).unwrap(), io::stdout());
    let (mut stdin, mut buffer) = (stdin.split_whitespace(), io::BufWriter::new(stdout.lock()));
    for _ in 0..stdin.next().unwrap().parse::<usize>().unwrap() {
        solve(&mut stdin, &mut buffer);
    }
}

fn solve(stdin: &mut std::str::SplitWhitespace, buffer: &mut io::BufWriter<io::StdoutLock>) {
    macro_rules! input {
        ($t: ty) => {
            stdin.next().unwrap().parse::<$t>().unwrap()
        };
        ($t: ty, $n: expr) => {
            (0..$n).map(|_| input!($t)).collect::<Vec<_>>()
        };
    }

    let mut N = input!(isize);
    let mut M = input!(isize);

    let mut ans = 0;
    let p = N / 4;
    N -= 4 * p;

    if M >= 4 * p {
        M -= 4 * p;
    } else {
        M = 0;
    }

    ans += p;

    if N > 0 {
        ans += 1;

        M -= 8 - N;

        if M < 0 {
            M = 0;
        }

        N = 0;
    }

    ans += (M + 7) / 8;

    writeln!(buffer, "{}", ans);
}