Проверял в консоле,вроде все работало
package com.javarush.task.task04.task0441;
/*
Как-то средненько
*/
import java.io.*;
import java.util.Scanner;
public class Solution {
public static void main(String[] args) throws Exception {
Scanner sc = new Scanner(System.in);
int a = sc.nextInt();
int b = sc.nextInt();
int c = sc.nextInt();
if(a > b && b > c)
System.out.println(b);
else if(b > a && a > c)
System.out.println(a);
else if(a > c && c > b)
System.out.println(c);
else if ((a == b && b < c)||(a == b && b > c))
System.out.println(a);
else if ((a == c && c < b)||(a == c && c > b))
System.out.println(a);
else if ((c == b && b < a)||(c == b && b > a))
System.out.println(c);
else if (a == b && b == c)
System.out.println(b);
}
}