foo.cpp:1:1: error: 'include' does not name a type
 include <iostream>
 ^
foo.cpp:6:23: error: 'sqrt' was not declared in this scope
 const double v=(sqrt(5)-1.0)/2.0;
                       ^
foo.cpp: In function 'int main()':
foo.cpp:9:12: error: 'cin' was not declared in this scope
      while(cin>>n){
            ^
foo.cpp:10:6: error: 'cout' was not declared in this scope
      cout<<(long long)(v*(n+1))<<endl; 
      ^
foo.cpp:10:34: error: 'endl' was not declared in this scope
      cout<<(long long)(v*(n+1))<<endl; 
                                  ^