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


public class Main_yukicoder851 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		int n = Integer.parseInt(sc.nextLine());
		
		String aa = sc.nextLine();
		String[] aaa = aa.split(" ");
		if (aaa.length > 1) {
			pr.println("assert");
			return;
		}

		long[] a = new long[n];
		a[0] = Long.parseLong(aaa[0]);
		for (int i = 1; i < n; i++) {
			a[i] = sc.nextLong();
		}

		Arrays.sort(a);

		long tmp = Math.max(a[0] + a[2], a[0] + a[1]);
		if (tmp == a[1] + a[2]) {
			tmp = a[0] + a[1];
		}
		
		pr.println(tmp);
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		pr = new Printer(System.out);
			
		solve();
			
		pr.close();
		sc.close();
	}

	static class Printer extends PrintWriter {
		Printer(OutputStream out) {
			super(out);
		}
		
		void printInts(int... a) {
			StringBuilder sb = new StringBuilder(32);
			for (int i = 0, size = a.length; i < size; i++) {
				if (i > 0) {
					sb.append(' ');
				}
				sb.append(a[i]);
			}

			println(sb);
		}
		
		void printLongs(long... a) {
			StringBuilder sb = new StringBuilder(64);
			for (int i = 0, size = a.length; i < size; i++) {
				if (i > 0) {
					sb.append(' ');
				}
				sb.append(a[i]);
			}

			println(sb);
		}
		
		void printStrings(String... a) {
			StringBuilder sb = new StringBuilder(32);
			for (int i = 0, size = a.length; i < size; i++) {
				if (i > 0) {
					sb.append(' ');
				}
				sb.append(a[i]);
			}

			println(sb);
		}
	}
}