#include<bits/stdc++.h>
using namespace std;
long long n;
int main(){
	cin>>n;
	long int g,s,b,q,w;
	g=n%10;
	s=n/10%10;
	b=n/100%10;
	q=n/1000%10;
	w=n/10000%10;
	cout<<g+s+b+q+w;
	return 0;
    
}
/**************************************************************
	Problem: 1418
	User: zengdongxin
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/