func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int k;     cin >> k;     cout << 7 + (3 * (k - 1)) << endl;     cout << 1 <<     << 1 << endl;     cout << 0 <<     << 1 << endl;     cout << 0 <<     << 0 << endl;     cout << 1 <<     << 0 << endl;     cout << 2 <<     << 2 << endl;     cout << 2 <<     << 1 << endl;     cout << 1 <<     << 2 << endl;     int i = 2;     while (i <= k) {       cout << i <<     << i + 1 << endl;       cout << i + 1 <<     << i << endl;       cout << i + 1 <<     << i + 1 << endl;       i++;     }   }   