package main

import (
	"bufio"
	"fmt"
	"os"
	"sort"
	"strconv"
	"strings"
)

func nextLine(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

func main() {
	var N int
	fmt.Scan(&N)
	sc := bufio.NewScanner(os.Stdin)
	a := make([]int, 0)
	for i := 0; i < N; i++ {
		ss := strings.Split(nextLine(sc), " ")
		if len(ss) != 1 {
			fmt.Println("assert")
			return
		}
		v, _ := strconv.Atoi(ss[0])
		a = append(a, v)
	}
	b := make([]int, 0)
	b = append(b, a[0]+a[1])
	b = append(b, a[0]+a[2])
	b = append(b, a[1]+a[2])
	sort.Sort(sort.Reverse(sort.IntSlice(b)))
	if b[0] == b[1] {
		fmt.Println(b[2])
	} else {
		fmt.Println(b[1])
	}
}