#include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio();     cin.tie();     int t, n, a, b;     cin >> t;     while (t--) {       int a, b;       cin >> a >> b;       int c = abs(a - b);       int ans = 0;       int tmp = c / 5;       ans += tmp;       c -= tmp * 5;       tmp = c / 2;       ans += tmp;       c -= tmp * 2;       tmp = c / 1;       ans += tmp;       c -= tmp * 1;       cout << ans << endl;     }     return 0;   }   