import java.util.Scanner;
public class Pest {
public static void main(String[] args) {
Scanner Lf=new Scanner(System.in);
String LinF;
System.out.println("请输入一个0-1000的整数来求整数各位数的和");
LinF = Lf.nextLine();
if(Integer.valueOf(LinF) <= 1000) {
int a = 0;
for (int i = 0; i < LinF.length(); i++) {
a = a + Integer.valueOf(LinF.substring(i, i + 1));
}
System.out.println(a);
}
}
}