import java.util.*;

public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int x,y,z;
        x = sc.nextInt();
        y = sc.nextInt();
        z = sc.nextInt();

       if(x%2==0 && y%2==0){
        System.out.println(z);
       }
       else if(y%2==0&& z%2==0){
        System.out.println(x);
       }
       else{
        System.out.println(y);
       }
    }
}