day06_1.js

"use strict";

process.stdin.resume();
process.stdin.setEncoding("utf-8");

let inputString = "";
let currentLine = 0;

process.stdin.on("data", (inputStdin) => {
  inputString += inputStdin;
});

process.stdin.on("end", (_) => {
  inputString = inputString
    .trim()
    .split("\n")
    .map((string) => {
      return string.trim();
    });

  main();
});

function readLine() {
  return inputString[currentLine++];
}

// function getMaxLessThanK(n, k) {
//   return (k | (k - 1)) > n ? k - 2 : k - 1;
// }

function getMaxLessThanK(n, k) {
  let max = 0;
  for (let a = 1; a < n; a++) {
    for (let b = a + 1; b <= n; b++) {
      if ((a & b) < k && (a & b) > max) {
        max = a & b;
      }
    }
  }
  return max;
}

function main() {
  const q = +readLine();

  for (let i = 0; i < q; i++) {
    const [n, k] = readLine().split(" ").map(Number);

    console.log(getMaxLessThanK(n, k));
  }
}