View Compilation Error

0_0_31771413_8983.cpp: In function 'int main()':
0_0_31771413_8983.cpp:4:5: error: 'cin' was not declared in this scope
     cin >> N;
     ^
0_0_31771413_8983.cpp:16:9: error: 'cout' was not declared in this scope
         cout << sum << endl;
         ^
0_0_31771413_8983.cpp:16:24: error: 'endl' was not declared in this scope
         cout << sum << endl;
                        ^