#include<bits/stdc++.h>
using namespace std;
int main(){ 
	int n,g,s,b,q,w;
	cin>>n;
	g = n % 10;
	s = n / 10 % 10;
	b = n / 100 % 10;
	q = n / 1000 % 10;
	w = n / 10000;
	cout<<g+s+b+q+w<<endl;	
} 



/**************************************************************
	Problem: 1418
	User: zhuangsongyu
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/