#include<bits/stdc++.h>
using namespace std;
int main(){ 
	int a,b,c,d,e,x,n;
	cin>>x;
	a=x%10;
	b=x/10%10; 
	c=x/100%10; 
	d=x/1000%10; 
	e=x/10000;
	n=a+b+c+d+e; 
	cout<<n;	
}
/**************************************************************
	Problem: 1418
	User: sucongyi
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/