import java.io.*;

class ReadNumber1
{
// Demonstrating writing your own string->integer converter
// (recursive version)

 public static void main(String[] args) 
 throws IOException
 {
  String num;
  int n;
  BufferedReader in = new 
   BufferedReader(new InputStreamReader(System.in));
  System.out.print("Please type an integer : ");
  num=in.readLine();
  n=stringToInt(num);
  System.out.println("The number you typed is: "+n);
 }

 public static int stringToInt(String str)
 {
  char last;
  String rest;
  if(str.length()==0)
     return 0;
  last=str.charAt(str.length()-1);
  rest=str.substring(0,str.length()-1);
  return stringToInt(rest)*10+convert(last);
 }

 private static int convert(char ch)
 {
  switch(ch)
  {
   case '0': return 0;
   case '1': return 1;
   case '2': return 2;
   case '3': return 3;
   case '4': return 4; 
   case '5': return 5;
   case '6': return 6; 
   case '7': return 7;
   case '8': return 8;
   case '9': return 9;
  }
  return 0;
 }

}