import java.util.Scanner;

public class WordorNumber2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int n = Integer.parseInt(scanner.nextLine());
        char sigh = ' ';
        double result = 0;
        String allWords = "";
        for (int i = 1; i <= n ; i++) {
            String input = scanner.nextLine();
            sigh = input.charAt(0);
            if ((sigh>= 'a' && sigh <= 'z') || (sigh>= 'A' && sigh <= 'Z')){
            }
            if (sigh >= '0' && sigh <= '9') {
                int number;
                number = Integer.parseInt(input);
                result = result + number;
            }
        }
        System.out.printf("%.0f", result);
    }
}