#include<bits/stdc++.h>
 using namespace std;
int main(){
	int n,g,s,b,q,w,h=0;
	scanf("%d",&n);
	g=n%10;
	s=n/10%10;
	b=n/100%10;
	q=n/1000%10;
	w=n/10000;
	h=g+s+b+q+w;
	printf("%d",h);
     return 0;
}
/**************************************************************
	Problem: 1418
	User: xiaojingxuan
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2076 kb
****************************************************************/