func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long a, b, c, d, e, i, j, has = 0;     cin >> a >> b;     has += (a / 5) * (b / 5);     c = a / 5;     d = b / 5;     if (a % 5 >= 1) c++;     if (b % 5 >= 4) d++;     has += (c * d);     c = a / 5;     d = b / 5;     if (a % 5 >= 2) c++;     if (b % 5 >= 3) d++;     has += (c * d);     c = a / 5;     d = b / 5;     if (a % 5 >= 3) c++;     if (b % 5 >= 2) d++;     has += (c * d);     c = a / 5;     d = b / 5;     if (a % 5 >= 4) c++;     if (b % 5 >= 1) d++;     has += (c * d);     cout << has <<   n ;   }   