#include<bits/stdc++.h>
using namespace std; 
int main(){
	int x,n,g,s,b,q,w;
	cin>>x;
	g=x%10;
	s=x/10%10;
	b=x/100%10;
	q=x/1000%10;
	w=x/10000; 
	n=g+s+b+q+w;
	cout<<n;
} 
/**************************************************************
	Problem: 1418
	User: chenjiahui
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/