#include <iostream>
using namespace std;
int main(){
	int n;
	cin>>n;
	int k = n / 10000;
	int y = n % 10000 / 1000;
	int u = n % 10000 % 100 /10;
	int i = n % 100 /10;
	int r = n %10;
	int l = k+y+u+i+r;
	cout<<l<<endl; 
}