[Algorithm] 데일리 백준

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.ArrayList;

public class Main {

  public static void main(String[] args) throws Exception {

    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
    StringBuilder sb = new StringBuilder();

//    //27866
//    String[] word = br.readLine().split("");
//    String order = br.readLine();
//
//    sb.append(word[Integer.parseInt(order)-1]);
//
//    System.out.println(sb);

//    //2743
//    String[] word = br.readLine().split("");
//
//    sb.append(word.length);
//
//    System.out.println(sb);

//    // 9086
//    String test = br.readLine();
//    int testCount = Integer.parseInt(test);
//
//    for(int i = 0 ; i < testCount ; i++){
//      String[] testWord = br.readLine().split("");
//      sb.append(testWord[0] + testWord[testWord.length-1] + "\n");
//    }
//
//    System.out.println(sb);

//    // 11654
//    String word = br.readLine();
//    char asCode = word.charAt(0);
//
//    int asCodeNum = (int) asCode;
//
//    System.out.println(asCodeNum);

    // 11720
    String a = br.readLine();
    String[] b = br.readLine().split("");

    int numCount = Integer.parseInt(a);
    int sum = 0;
    for (int i = 0; i < numCount; i++) {
      sum += Integer.parseInt(b[i]);
    }
    System.out.println(sum);

  }
}