import java.io.*;
import java.util.Scanner;

public class Solution {
    public static void main(String[] args) throws Exception {
       int a;
       int b;
       int c;
       Scanner aa=new Scanner(System.in);
       a=aa.nextInt();
       b=aa.nextInt();
       c=aa.nextInt();
      if (a>b && a<c) { System.out.println(a); }
      else
       if (b>a && b<c) { System.out.println(b); }
          else
          if (c>a && c<b)  { System.out.println(c); }
             else
             if (a==b || b==c) { System.out.println(b); }
                else
                System.out.println(a);
} }