import java.io.; import java.util.; import java.util.regex.*;

public class Solution {

public static void main(String[] args) {
  Scanner keyboard = new Scanner(System.in);
  String input;
  while(keyboard.hasNext()){
    input = keyboard.next();
    System.out.println(validate(input));
  }
  keyboard.close();
}

public static boolean validate(String input){

    String arr [] = input.split("[\\.]");
    if(arr.length != 4)
        return false;

    Pattern p = Pattern.compile("[0-9]+");
    for(String s : arr){
      if(s.length() > 3){
        return false;
      }
      Matcher m = p.matcher(s);
        if((m.matches()) == false)
            return false;
      Integer value = Integer.parseInt(s);
      if(value < 0 || value > 255)
        return false;
    }
    return true;
}   

}