View Compilation Error

0_0_39395692_24211.cpp: In function 'int main()':
0_0_39395692_24211.cpp:5:16: error: 'cin' was not declared in this scope
    5 |         while (cin >> n) {
      |                ^~~
0_0_39395692_24211.cpp:21:17: error: 'cout' was not declared in this scope
   21 |                 cout << port << endl;
      |                 ^~~~
0_0_39395692_24211.cpp:21:33: error: 'endl' was not declared in this scope
   21 |                 cout << port << endl;
      |                                 ^~~~