#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    int g=n/1%10;
    int s=n/10%10;
    int b=n/100%10;
	int q=n/1000%10;
	int w=n/10000%10;
	cout<<g+s+b+q+w;
	return 0;
}

/**************************************************************
	Problem: 1418
	User: duyahan
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/