package main

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

func main() {
	var i, n int64
	sum := new(big.Int)

	fmt.Scan(&n)

	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)

	for i = 0; i < n; i++ {
		sc.Scan()
		s := sc.Text()
		x, _ := new(big.Int).SetString(s, 10)
		sum = sum.Add(sum, x)
	}
	fmt.Println(sum)
}