# include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c,d,e,f;
	cin>>a;

	
	e=a/10000;a=a%10000;
	d=a/1000;a=a%1000;
	c=a/100;a=a%100;
	b=a/10;a=a%10;
	cout<<b+c+d+e+a;
	
	
	




    return 0;
}

/**************************************************************
	Problem: 1418
	User: caiqiaoxi
	Language: C++
	Result: Accepted
	Time:27 ms
	Memory:2072 kb
****************************************************************/