题目描述

import java.util.Scanner;

public class Main {

public static void main(String args[]){

    Scanner sc = new Scanner(System.in);
    char[] day = sc.nextLine().toCharArray();
    int count = 0;
    for(int i = 1;i<day.length;i++) {
        if('1'== day[i]) {
            count++;
        }
    }
    System.out.println(count);

}

}