/* 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
	{
 
        LocalDate firstDayOfPayPeriod = LocalDate.of( 2020 , Month.OCTOBER , 23 );
        LocalDate firstDayOfSuccessivePayPeriod = LocalDate.of( 2020 , 11 , 7 );
 
        String input = "2020-10-31";
        LocalDate dateInQuestion = null;
        try
        {
            dateInQuestion = LocalDate.parse( input );
        }
        catch ( DateTimeParseException e )
        {
            // Handle faulty input.
            e.printStackTrace();
        }
 
        // Validate dates.
        Objects.requireNonNull( firstDayOfPayPeriod );
        Objects.requireNonNull( firstDayOfSuccessivePayPeriod );
        Objects.requireNonNull( dateInQuestion );
        if ( ! firstDayOfPayPeriod.isBefore( firstDayOfSuccessivePayPeriod ) )
        {
            throw new IllegalStateException( "…" );
        }
        if ( dateInQuestion.isBefore( firstDayOfPayPeriod ) )
        {
            throw new IllegalStateException( "…" );
        }
        if ( ! dateInQuestion.isBefore( firstDayOfSuccessivePayPeriod ) )
        {
            throw new IllegalStateException( "…" );
        }
 
 
        long payPerDay = 100;
        long partialPay = 0;
 
        LocalDate localDate = firstDayOfPayPeriod;
        while ( localDate.isBefore( firstDayOfSuccessivePayPeriod ) )
        {
            if ( localDate.isBefore( dateInQuestion ) )
            {
                partialPay = ( partialPay + payPerDay );
            }
 
            // Set up the next loop.
            // Notice that java.time uses immutable objects. So we generate a new object based on another’s values rather than alter (mutate) the original.
            localDate = localDate.plusDays( 1 ); // Increment to next date.
        }
 
        System.out.println( "Partial pay earned from firstDayOfPayPeriod " + firstDayOfPayPeriod + " to dateInQuestion " + dateInQuestion + " is " + partialPay );
 
 
 
	}
}

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