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

/**************************************************************
	Problem: 1418
	User: chenjunlin
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/