#include<bits/stdc++.h>
using namespace std; 
int main(){
    int x,n,g,s,b,q,w;
    cin>>x;
    g=x%10;
    s=x/10%10;
    b=x/100%10;
    q=x/1000%10;
    w=x/10000; 
    n=g+s+b+q+w;
    cout<<n；
}
/**************************************************************
	Problem: 1028
	User: chenjiahui
	Language: C++
	Result: Compile Error
****************************************************************/