/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
   private static boolean looksLikeIpV4(String ipAddress) {
      Pattern V4_PATTERN = Pattern.compile("\\d+(\\.\\d+){3}");
 
      Matcher matcher = V4_PATTERN.matcher(ipAddress);
      return matcher.matches();
   }
	public static void main (String[] args) throws java.lang.Exception
	{
		String temp = "172.16.1.24";
		System.out.println(looksLikeIpV4(temp));
	}
}

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