придирается к Math
package com.javarush.task.task04.task0441;
import java.io.*;
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader r = new BufferedReader(new InputStreamReader(System.in));
String a = r.readLine();
String b = r.readLine();
String c = r.readLine();
int num1 = Integer.parseInt(a);
int num2 = Integer.parseInt(b);
int num3 = Integer.parseInt(c);
if(a==b&&b==c&&a==c) System.out.println(a);
else if(a==b||a==c) System.out.println(a);
else if(b==c) System.out.println(b);
else { int max = Math.max(Math.max(a, b), c);
int min = Math.min(Math.min(a, b), c);
int mid = a + b + c - (max + min);
System.out.println(mid);
}
}
}