#include <bits/stdc++.h>
using namespace std;
vector<long long> c(61);
void solve() {
  long long x;
  int y;
  cin >> x >> y;
  if(!(x >> y & 1)) {
    cout << 0 << '\n';
  } else {
    int i = 0;
    while(!(x >> i & 1)) {
      i++;
    }
    while(x >> i & 1) {
      i++;
    }
    cout << c[i - 1] << '\n';
  }
}
int main() {
  c[0] = 1;
  for(int i = 1; i < 61; i++) {
    c[i] = c[i - 1] + (1LL << i);
  }
  int T;
  cin >> T;
  while(T--) {
    solve();
  }
  return 0;
}