import java.util.*;


public class Organization {

	HashSet<Member> members = new HashSet<Member>();

	double calcPayroll() {
		double total = 0;
		for(Member member: members) {
			if (member instanceof HourlyMember) {
				HourlyMember hm = (HourlyMember)member;
				total += hm.hours * hm.rate;
			} else if (member instanceof SalariedMember) {
				SalariedMember sm = (SalariedMember)member;
				total += sm.salary/12;
			} else if (member instanceof CommissionedMember) {
				CommissionedMember cm = (CommissionedMember)member;
				total += .1 * cm.sales;
			} else {
				System.err.println("Unknown type of member");
				System.exit(1);
			}
		}
		return total;
	}
}