/* 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.* ;
import java.time.chrono.* ;
import java.time.zone.* ;
 
/* 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
	{
		System.out.println(
			OffsetDateTime
			.of( 
			    LocalDate.parse( "2021-01-23" ) , 
			    LocalTime.MIN , 
			    ZoneOffset.UTC 
			)
			.toInstant()
			.toEpochMilli()
		);
	}
}

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