foo.cpp: In function 'int main()':
foo.cpp:4:1: error: 'cout' was not declared in this scope
 cout<<1398595;
 ^
foo.cpp:4:1: note: suggested alternative:
In file included from foo.cpp:2:0:
c:\tdm-gcc-32\lib\gcc\mingw32\4.8.1\include\c++\iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^