func_code_string: #include <bits/stdc++.h>   using namespace std;   int t, a, b;   void fn() {     cin >> a >> b;     if (a < b) swap(a, b);     a -= b;     int ans = a / 5;     a %= 5;     if (a == 1 || a == 2)       ans++;     else if (a == 3 || a == 4)       ans += 2;     cout << ans << endl;   }   int main() {     cin >> t;     while (t--) fn();     return 0;   }   