#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,g,s,b,q,w,h;
    cin>>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;
    cout<<h;
    return 0;
}

/**************************************************************
	Problem: 1418
	User: zhangyilei
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/