View Compilation Error

0_0_30151190_24255.cpp:1:1: error: 'include' does not name a type
 include <iostream>
 ^
0_0_30151190_24255.cpp: In function 'int main()':
0_0_30151190_24255.cpp:7:11: error: 'cin' was not declared in this scope
     while(cin>>n)
           ^
0_0_30151190_24255.cpp:9:8: error: 'cout' was not declared in this scope
        cout<<(n*n+11*n+14)/2<<endl;
        ^
0_0_30151190_24255.cpp:9:31: error: 'endl' was not declared in this scope
        cout<<(n*n+11*n+14)/2<<endl;
                               ^