View Compilation Error

0_0_30211781_22071.cpp: In function 'int main()':
0_0_30211781_22071.cpp:15:9: error: 'cin' was not declared in this scope
         cin>>n;
         ^
0_0_30211781_22071.cpp:39:46: error: 'cout' was not declared in this scope
                                              cout<<count<<endl;
                                              ^
0_0_30211781_22071.cpp:39:59: error: 'endl' was not declared in this scope
                                              cout<<count<<endl;
                                                           ^