public class Person {
	
	String name;
	
	int age;
	
	double salary;
	
	static int personCount = 0;
	
	public Person(String n) {
		name = n;
		personCount++;
	} 
	
	public Person(String n, int a, double s) {
		this(n);
		age = a;
		salary = s;
	} 
	
	public double getSalary() {
		return salary;
	}
	
	public static void writePersonCount() {
		System.out.println(personCount);
	}
	
	public void writeInfo() {
		System.out.println("name="+name);
		System.out.println("age="+age);
		System.out.println("salary="+salary);
	}
	  
	public static void main(String[] args) {
		
		Person petr = new Person("Petr Novak"); //"Petr Novak", 25, 10000.5
		
		Person petrPodruhe = petr;
		petrPodruhe.age = 100;
		
		writePersonCount();
		
	}
}