View Compilation Error

0_0_27274703_24079.cpp: In function 'int main()':
0_0_27274703_24079.cpp:8:19: error: 'n' was not declared in this scope
     for(int i=0;i<n;i++)
                   ^
0_0_27274703_24079.cpp:12:5: error: 'cout' was not declared in this scope
     cout<<2000<<endl;
     ^
0_0_27274703_24079.cpp:12:17: error: 'endl' was not declared in this scope
     cout<<2000<<endl;
                 ^