С++ выдает ошибку "cin was not declared in this scope"? в чем причина

#incloude
using namespace std;

int main()
{
int a,b;

cout << "vvedite poshalusta dva chisla\n";
cin >>a>> b ;

cout <<"Summa" << a << "i" <<b<< "ravna" <<a +b << endl;
cout <<"Raznost" << a <<"i" <<b<< "ravna" << a-b << endl;
cout <<"Proizvedenie" << a << "i" <<b<< "ravna" << a*b << endl;
cout <<"Chastnoe" <<a<<"i"<<b<< "ravna" <<a/b<< endl;

return 0
}