package main

import (
	"fmt"
	"strconv"
)

func main() {
	var i, n, sum int64
	var s string

	fmt.Scan(&n)
	for i = 0; i < n; i++ {
		fmt.Scan(&s)
		if x, err := strconv.ParseInt(s, 10, 64); err == nil {
			sum += x
		}
	}
	fmt.Println(sum)
}