4ое условие не хочет пропускать
package com.javarush.task.task04.task0424;
import java.io.InputStreamReader;
import java.io.BufferedReader;
/*
Три числа
*/
public class Solution {
public static void main(String[] args) throws Exception {
//напишите тут ваш код
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String aa = reader.readLine();
String bb = reader.readLine();
String cc = reader.readLine();
int a = Integer.parseInt(aa);
int b = Integer.parseInt(bb);
int c = Integer.parseInt(cc);
if (a != b && a == c)
System.out.println(2);
if (a == b && a != c)
System.out.println(3);
if (a != b && a != c)
System.out.println(1);
else if (a != b && a != c && b != c)
System.out.println();
}
}