#include <bits/stdc++.h>
#define ll long long int
#define ld long double
using namespace std;

void mainSolve()
{
  int k, x;
  cin >> k >> x;
  k *= 7;
  int ans = k - x;
  cout << ans << endl;
}

int main()
{
#ifndef ONLINE_JUDGE
  freopen("input.txt", "r", stdin);
  freopen("output.txt", "w", stdout);
#endif
  int t;
  cin >> t;
  while (t--)
  {
    mainSolve();
  }
  return 0;
}