#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int a[n], b[n];
  for (long long i = 0; i < n; i++) {
    cin >> a[i] >> b[i];
  }
  for (long long i = 0; i < n; i++) {
    cout << b[i] * 2 << endl;
  }
}
