#include <bits/stdc++.h>
using namespace std;
template <typename Arg1>
void __f(const char* name, Arg1&& arg1) {
  cerr << name << " : " << arg1 << std::endl;
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args) {
  const char* comma = strchr(names + 1, ',');
  cerr.write(names, comma - names) << " : " << arg1 << " | ";
  __f(comma + 1, args...);
}
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  ;
  int t;
  cin >> t;
  while (t--) {
    int a, b;
    cin >> a >> b;
    int diff = abs(a - b);
    int ans = 0;
    ans += (diff / 5);
    diff %= 5;
    ans += (diff / 2);
    diff %= 2;
    ans += (diff);
    cout << ans << endl;
  }
  return 0;
}
