#include<bits/stdc++.h>
using namespace std;
int main(){
    int x,s,g,sh,b,q,w;
    cin>>x;
    g=x%10;
    sh=x/10%10;
    b=x/100%10;
    q=x/1000%10;
    w=x/10000;
    s=g+sh+b+q+w;
    cout<<s;
     
}
/**************************************************************
	Problem: 1418
	User: huanglingkai
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/