import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class Main {
    
    public static void main(String[] args) {
        ArrayList<Integer> list = new ArrayList<Integer>();
        Scanner in = new Scanner(System.in);
        while(true) {
            int a = in.nextInt();
            if(a == 0)
                break;
            list.add(a);
        }
        Collections.sort(list);
        System.out.println(list.get(list.size() - 2));
    }
}