func_code_string: #include <bits/stdc++.h>   using namespace std;   int32_t main() {     int64_t t;     cin >> t;     for (int64_t i = 0; i < t; i++) {       int64_t a, b;       cin >> a >> b;       if (a == b) {         cout << 0 << endl;         continue;       }       int64_t k = abs(b - a);       int64_t ans = k / 5;       k %= 5;       ans += k / 2;       k %= 2;       ans += k;       cout << ans << endl;     }   }   