code
package pl.codegym.task.task04.task0424;
/*
Trzy liczby
*/
import java.io.*;
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String liczba1 = reader.readLine();
String liczba2 = reader.readLine();
String liczba3 = reader.readLine();
int a =Integer.parseInt(liczba1);
int b =Integer.parseInt(liczba2);
int c =Integer.parseInt(liczba3);
if (a == b && a != c && a != b) {
System.out.println(c);
}
if (a == c && a != b && b != c) {
System.out.println(b);
}
if (c == b && b != a && a != c) {
System.out.println(a);
}
}
}