Sacar Cantidad en c++

#include<iostream.h>
#include<conio.h>
void main()
{
int CANT, B20, B10, B5, B1;
clrscr();
cout<<"Ingrese cantidad: ";cin>>CANT;
B20 = CANT/20;
CANT = CANT%20;
B10 = CANT/10;
CANT = CANT%10;
B5 = CANT/5;
B1 = CANT%5;
cout<<"Billetes de 20: "<<B20;
cout<<"Billetes de 10: "<<B10;
cout<<"Billetes de 5: "<<B5;
cout<<"Billetes de 1: "<<B1;
getch();
}