package con_level_1half;
import java.util.Scanner;
import java.util.TreeSet;
public class Con851 {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		s.nextLine();
		String str = s.nextLine();
		Long A1 = 0l,A2 = 0l,A3 = 0l;
		if(str.contains(" ")){
			System.out.println("\"assert\"");
		}else{
			A1 = Long.parseLong(str);
			A2 = s.nextLong();
			A3 = s.nextLong();

			TreeSet<Long> ts = new TreeSet();
			ts.add(A1+A2);
			ts.add(A1+A3);
			ts.add(A2+A3);
			if(ts.size() > 1){
				ts.pollLast();
			}

			System.out.println(ts.pollLast());
		}
		s.close();
	}

}