Помогите найти ошибку
package com.javarush.task.task18.task1808;
/*
Разделение файла
*/
import javax.swing.plaf.basic.BasicButtonUI;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
public class Solution {
public static void main(String[] args) throws Exception{
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String fileName1 = reader.readLine();
String fileName2 = reader.readLine();
String fileName3 = reader.readLine();
FileInputStream fileInputStream = new FileInputStream(fileName1);
FileOutputStream fileOutputStream1 = new FileOutputStream(fileName2);
FileOutputStream fileOutputStream2 = new FileOutputStream(fileName3);
reader.close();
byte[] buffer = new byte[fileInputStream.available()];
while (fileInputStream.available() > 0 ){
int count = fileInputStream.read(buffer);
int middle = 0;
if(count % 2 == 0){
middle = count / 2;
}
else {
middle = (count + 3)/2;
}
fileOutputStream1.write(buffer, 0, middle);
fileOutputStream2.write(buffer, middle, count);
}
fileInputStream.close();
fileOutputStream1.close();
fileOutputStream2.close();
}
}