#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,g,s,b,q,h,w;
	cin>>n;
	g=n%10;
	s=n%100/10;
	b=n%1000/100;
	q=n%10000/1000;
	w=n/10000;
	h=g+s+b+q+w;
	cout<<h;
	return 0;
}
/**************************************************************
	Problem: 1418
	User: fuhoubin
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/