import java.io.*;

class ReadNumber
{
// Demonstrating writing your own string->integer converter
// (iterative 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)
 {
  int n=0;
  for(int i=0;i<str.length();i++)
     n=n*10+convert(str.charAt(i));
  return n;
 }

 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;
 }

}