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

void mainSolve()
{
  int n, k;
  cin >> n >> k;
  int total = (n + 4) / 5;
  int unaffected = (k + 4) / 5;
  int affected = total - unaffected;
  cout << affected << 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;
}