package main

import (
	"bufio"
	"fmt"
	"math/big"
	"os"
	"strings"
)

func main() {
	var n int64
	var sum *big.Int

	sum = new(big.Int)
	fmt.Scan(&n)
	r := bufio.NewReader(os.Stdin)
	b, _, _ := r.ReadLine()

	ss := strings.Split(string(b), " ")
	for _, v := range ss {
		x, _ := new(big.Int).SetString(v, 10)
		y := sum.Add(sum, x)
		sum = y
	}

	fmt.Println(sum)
}