[Bronze Ⅳ] 11720 - 숫자의 합

import java.io.BufferedReader;
import java.io.InputStreamReader;
public class BOJ_11720 { 
    public static void main(String[] args) throws Exception{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int N = Integer.parseInt(br.readLine());
        char[] num = br.readLine().toCharArray();
        int sum = 0;
        for(char c : num) sum += Character.getNumericValue(c);
    
        System.out.println(sum);
    }
}