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