public class nody{

     static int change(int m,int n)
     {

         if(m==1 | n==1)
         return 1;


         return change(m-1,n)+change(m,n-1);
     }

     public static void main(String []args)
     {
        nody obj = new nody();
        System.out.println(obj.change(2,3));

     }
}