/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
import java.time.* ;
import java.time.format.* ;
import java.time.temporal.* ;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
 
    ZonedDateTime now = ZonedDateTime.now( ZoneId.systemDefault() ) ;
    System.out.println(
        Duration
        .between(
            now , 
            now.plusHours( 500L ) 
        )
        .toHours()
    ) ;
 
	}
}

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