func_code_string: #include <bits/stdc++.h>   using namespace std;   bool vis[100005];   int main() {     int n;     while (cin >> n) {       int i, tag = 0, num = 0;       for (i = 5;; i += 5) {         int x = i;         while (x % 5 == 0 && x) {           num++;           x /= 5;         }         if (num == n) {           tag = 1;           break;         } else if (num > n)           break;       }       if (tag) {         cout <<  5  << endl;         for (int p = 0; p < 5; p++) cout << i + p <<    ;         cout << endl;       } else         cout <<  0  << endl;     }     return 0;   }   