class Student
{
    static int num;
    int number;

    int add1( )
    {
        num=num+1;
        return num;
    }

    int add2( )
    {
        number=number+1;
        return number;
    }
}

public class StuDemo
{
    public static void main(String args[ ])
    {
        Student zhang=new Student( );
        Student wang=new Student( );
        Student jiang=new Student( );
        System.out.println("zhang.num="+zhang.add1( ));
        System.out.println("zhang.number="+zhang.add2( ));
        System.out.println("wang.num="+wang.add1( ));
        System.out.println("wang.number="+wang.add2( ));
        System.out.println("jiang.num="+jiang.add1( ));
        System.out.println("jiang.number="+jiang.add2( ));
    }
}