import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        try {
            Integer.parseInt(sc.nextLine());
            int[] arr = new int[3];
            for (int i = 0; i < 3; i++) {
                arr[i] = Integer.parseInt(sc.nextLine());
            }
            TreeSet<Integer> sums = new TreeSet<>();
            for (int i = 0; i < 2; i++) {
                for (int j = i + 1; j < 3; j++) {
                    sums.add(arr[i] + arr[j]);
                }
            }
            sums.pollLast();
            System.out.println(sums.last());
            
        } catch (Exception e) {
            System.out.println("\"assert\"");
        }
    }
}