p03587 Tenka1 Programmer Beginner Contest - Accepted...?_17012
Snuke prepared 6 problems for a upcoming programming contest. For each of those problems, Rng judged whether it can be used in the contest or not.

You are given a string S of length 6. If the i-th character of s is `1`, it means that the i-th problem prepared by Snuke is accepted to be used; `0` means that the problem is not accepted.

How many problems prepared by Snuke are accepted to be used in the contest?

Constraints

* The length of S is 6.
* S consists of `0` and `1`.

Inputs

Input is given from Standard Input in the following format:


S


Outputs

Print the number of problems prepared by Snuke that are accepted to be used in the contest.

Examples

Input

111100


Output

4


Input

001001


Output

2


Input

000000


Output

0
import java.util.*;

public class Main{
	
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
  	char[] ch=sc.next().toCharArray();
    int f=0;
    for(int i=0;i<6;i++){
      if(ch[i]=='1'){
        f++;
      }
    }
    System.out.println(f);
    
  }
}
