Source Code Mencari Total Harga dan Diskon (C++)

#include <iostream.h>
void main ()
{
 long beli,bayar,diskon ;
 char member ;
 cout<<"Program Member dan Diskon di Toko "<<endl;
 cout<<"=================================="<<endl<<endl;
 cout<<"Berapa Total Belanjaan anda ? : " ;
 cin>>beli ;
 cout<<"Apakah Anda Member ? [Y/N] : ";
 cin>>member ;
if (member == 'Y')
{
if (beli > 500000)
{
bayar = (beli * 5) / 100 ;
}
else if (beli >1000000)
{
bayar = (beli * 10) /100;
}
else if (beli >5000000)
{
bayar = (beli *15) / 100 ;
}
else if (beli >10000000)
{
bayar = (beli *20) / 100 ;
}
else if (beli < 500000)
{
bayar = beli ;
goto akhir;
}
diskon =  beli - bayar ;
cout<<"Total yang harus dibayar (member) : "<<diskon<<endl;
}
else
{
akhir:
cout<<"Total yang harus dibayar : "<<beli ;
}
cout<<"\n\n\n              arddiizon             "<<endl;
}