foo.cpp:1:1: error: 'include' does not name a type
 include<iostream> 
 ^
foo.cpp: In function 'int main()':
foo.cpp:7:1: error: 'cin' was not declared in this scope
 cin>>k;
 ^
foo.cpp:12:1: error: 'cout' was not declared in this scope
 cout<<"YES"<<endl;
 ^
foo.cpp:12:14: error: 'endl' was not declared in this scope
 cout<<"YES"<<endl;
              ^
foo.cpp:14:1: error: 'cout' was not declared in this scope
 cout<<"NO"<<endl;
 ^
foo.cpp:14:13: error: 'endl' was not declared in this scope
 cout<<"NO"<<endl;
             ^